对于每个重复数百次只有几个记录

Question

我正在使用php简单的dom解析器屏幕抓取器，我正在尝试将其设置为刮取页面的内容。问题是它将数据拉到了ok，但它一遍又一遍地重复它，我无法找出原因。似乎每条记录都重复了好几次。

    <?php
    // example of how to use basic selector to retrieve HTML contents
    include('../simple_html_dom.php');

    // get DOM from URL or file
    $html = file_get_html('http://www.goldengrovenursery.co.uk/griffin_x/results.asp?txtgenus=Chamaecyparis&txtcultivar=&txtcolour=All&Search=Availability&offset=40');



    echo '<table>
    <thead><th>Genus</th><th>Cultivar</th></thead>
    <tbody>';
    foreach($html->find('td.genus') as $a)
    foreach($html->find('td.cultivar') as $b)
    foreach($html->find('td.species') as $c)
        echo '<tr><td>'.$a->innertext.'</td><td>'.$b->innertext.'</td><td>'.$c->innertext.'</td></tr>';
    echo '</tbody>
    </table>
    ';
    ?>

其抓取的页面在这里： http://www.goldengrovenursery.co.uk/griffin_x/results.asp?txtgenus=Chamaecyparis&txtcultivar=&txtcolour=All&Search=Availability&offset=40

上面的脚本最终看起来像这样，即使页面上只有10条记录：

    Genus   Cultivar
    Genus       Colour
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       thyoides
    Genus       obtusa
    Genus       lawsoniana
    Genus       obtusa
    Genus       pisifera
    Genus       Colour
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       thyoides
    Genus       obtusa
    Genus       lawsoniana
    Genus       obtusa
    Genus       pisifera
    Genus       Colour
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       thyoides
    Genus       obtusa
    Genus       lawsoniana
    Genus       obtusa
    Genus       pisifera
    Genus    Cultivar   Colour
    Genus    Cultivar   pisifera
    Genus    Cultivar   pisifera
    Genus    Cultivar   pisifera
    Genus    Cultivar   pisifera
    Genus    Cultivar   pisifera
    Genus    Cultivar   thyoides
    Genus    Cultivar   obtusa
    Genus    Cultivar   lawsoniana
    Genus    Cultivar   obtusa
    Genus    Cultivar   pisifera
    Genus       Colour
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       pisifera
    Genus       thyoides
    Genus       obtusa
    Genus       lawsoniana
    Genus       obtusa
    Genus       pisifera
    Genus   FILIFERA NANA   Colour
    Genus   FILIFERA NANA   pisifera
    Genus   FILIFERA NANA   pisifera
    Genus   FILIFERA NANA   pisifera
    Genus   FILIFERA NANA   pisifera
    Genus   FILIFERA NANA   pisifera
    Genus   FILIFERA NANA   thyoides
    Genus   FILIFERA NANA   obtusa
    Genus   FILIFERA NANA   lawsoniana
    Genus   FILIFERA NANA   obtusa
    Genus   FILIFERA NANA   pisifera
    Genus   NANA    Colour
    Genus   NANA    pisifera
    Genus   NANA    pisifera
    Genus   NANA    pisifera
    Genus   NANA    pisifera
    Genus   NANA    pisifera
    Genus   NANA    thyoides
    Genus   NANA    obtusa
    Genus   NANA    lawsoniana
    Genus   NANA    obtusa
    Genus   NANA    pisifera
    Genus   NANA AUREOVARIEGATA Colour
    Genus   NANA AUREOVARIEGATA pisifera
    Genus   NANA AUREOVARIEGATA pisifera
    Genus   NANA AUREOVARIEGATA pisifera
    Genus   NANA AUREOVARIEGATA pisifera
    Genus   NANA AUREOVARIEGATA pisifera
    Genus   NANA AUREOVARIEGATA thyoides
    Genus   NANA AUREOVARIEGATA obtusa
    Genus   NANA AUREOVARIEGATA lawsoniana
    Genus   NANA AUREOVARIEGATA obtusa
    Genus   NANA AUREOVARIEGATA pisifera
    Genus   SQUARROSA SULPHUREA Colour
    Genus   SQUARROSA SULPHUREA pisifera
    Genus   SQUARROSA SULPHUREA pisifera
    Genus   SQUARROSA SULPHUREA pisifera
    Genus   SQUARROSA SULPHUREA pisifera
    Genus   SQUARROSA SULPHUREA pisifera
    Genus   SQUARROSA SULPHUREA thyoides
    Genus   SQUARROSA SULPHUREA obtusa
    Genus   SQUARROSA SULPHUREA lawsoniana
    Genus   SQUARROSA SULPHUREA obtusa
    Genus   SQUARROSA SULPHUREA pisifera
    Genus   SUNGOLD Colour
    Genus   SUNGOLD pisifera
    Genus   SUNGOLD pisifera
    Genus   SUNGOLD pisifera
    Genus   SUNGOLD pisifera
    Genus   SUNGOLD pisifera
    Genus   SUNGOLD thyoides
    Genus   SUNGOLD obtusa
    Genus   SUNGOLD lawsoniana
    Genus   SUNGOLD obtusa
    Genus   SUNGOLD pisifera
    Genus   TOP POINT   Colour
    Genus   TOP POINT   pisifera
    Genus   TOP POINT   pisifera
    Genus   TOP POINT   pisifera
    Genus   TOP POINT   pisifera
    Genus   TOP POINT   pisifera
    Genus   TOP POINT   thyoides
    Genus   TOP POINT   obtusa
    Genus   TOP POINT   lawsoniana
    Genus   TOP POINT   obtusa
    Genus   TOP POINT   pisifera
    Genus   TSATSUMI GOLD   Colour
    Genus   TSATSUMI GOLD   pisifera
    Genus   TSATSUMI GOLD   pisifera
    Genus   TSATSUMI GOLD   pisifera
    Genus   TSATSUMI GOLD   pisifera
    Genus   TSATSUMI GOLD   pisifera
    Genus   TSATSUMI GOLD   thyoides
    Genus   TSATSUMI GOLD   obtusa
    Genus   TSATSUMI GOLD   lawsoniana
    Genus   TSATSUMI GOLD   obtusa
    Genus   TSATSUMI GOLD   pisifera
    Genus   NICHOLE Colour
    Genus   NICHOLE pisifera
    Genus   NICHOLE pisifera
    Genus   NICHOLE pisifera
    Genus   NICHOLE pisifera
    Genus   NICHOLE pisifera
    Genus   NICHOLE thyoides
    Genus   NICHOLE obtusa
    Genus   NICHOLE lawsoniana
    Genus   NICHOLE obtusa
    Genus   NICHOLE pisifera
    Genus   RIGID DWARF Colour
    Genus   RIGID DWARF pisifera
    Genus   RIGID DWARF pisifera
    Genus   RIGID DWARF pisifera
    Genus   RIGID DWARF pisifera
    Genus   RIGID DWARF pisifera
    Genus   RIGID DWARF thyoides
    Genus   RIGID DWARF obtusa
    Genus   RIGID DWARF lawsoniana
    Genus   RIGID DWARF obtusa
    Genus   RIGID DWARF pisifera
    Genus   TRUE BLUE   Colour
    Genus   TRUE BLUE   pisifera
    Genus   TRUE BLUE   pisifera
    Genus   TRUE BLUE   pisifera
    Genus   TRUE BLUE   pisifera
    Genus   TRUE BLUE   pisifera
    Genus   TRUE BLUE   thyoides
    Genus   TRUE BLUE   obtusa
    Genus   TRUE BLUE   lawsoniana
    Genus   TRUE BLUE   obtusa
    Genus   TRUE BLUE   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis    Cultivar   Colour
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   thyoides
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   lawsoniana
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis   FILIFERA NANA   Colour
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   thyoides
    Chamaecyparis   FILIFERA NANA   obtusa
    Chamaecyparis   FILIFERA NANA   lawsoniana
    Chamaecyparis   FILIFERA NANA   obtusa
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   NANA    Colour
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    thyoides
    Chamaecyparis   NANA    obtusa
    Chamaecyparis   NANA    lawsoniana
    Chamaecyparis   NANA    obtusa
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA AUREOVARIEGATA Colour
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA thyoides
    Chamaecyparis   NANA AUREOVARIEGATA obtusa
    Chamaecyparis   NANA AUREOVARIEGATA lawsoniana
    Chamaecyparis   NANA AUREOVARIEGATA obtusa
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA Colour
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA thyoides
    Chamaecyparis   SQUARROSA SULPHUREA obtusa
    Chamaecyparis   SQUARROSA SULPHUREA lawsoniana
    Chamaecyparis   SQUARROSA SULPHUREA obtusa
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SUNGOLD Colour
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD thyoides
    Chamaecyparis   SUNGOLD obtusa
    Chamaecyparis   SUNGOLD lawsoniana
    Chamaecyparis   SUNGOLD obtusa
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   TOP POINT   Colour
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   thyoides
    Chamaecyparis   TOP POINT   obtusa
    Chamaecyparis   TOP POINT   lawsoniana
    Chamaecyparis   TOP POINT   obtusa
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TSATSUMI GOLD   Colour
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   thyoides
    Chamaecyparis   TSATSUMI GOLD   obtusa
    Chamaecyparis   TSATSUMI GOLD   lawsoniana
    Chamaecyparis   TSATSUMI GOLD   obtusa
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   NICHOLE Colour
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE thyoides
    Chamaecyparis   NICHOLE obtusa
    Chamaecyparis   NICHOLE lawsoniana
    Chamaecyparis   NICHOLE obtusa
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   RIGID DWARF Colour
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF thyoides
    Chamaecyparis   RIGID DWARF obtusa
    Chamaecyparis   RIGID DWARF lawsoniana
    Chamaecyparis   RIGID DWARF obtusa
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   TRUE BLUE   Colour
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   thyoides
    Chamaecyparis   TRUE BLUE   obtusa
    Chamaecyparis   TRUE BLUE   lawsoniana
    Chamaecyparis   TRUE BLUE   obtusa
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis    Cultivar   Colour
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   thyoides
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   lawsoniana
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis   FILIFERA NANA   Colour
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   thyoides
    Chamaecyparis   FILIFERA NANA   obtusa
    Chamaecyparis   FILIFERA NANA   lawsoniana
    Chamaecyparis   FILIFERA NANA   obtusa
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   NANA    Colour
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    thyoides
    Chamaecyparis   NANA    obtusa
    Chamaecyparis   NANA    lawsoniana
    Chamaecyparis   NANA    obtusa
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA AUREOVARIEGATA Colour
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA thyoides
    Chamaecyparis   NANA AUREOVARIEGATA obtusa
    Chamaecyparis   NANA AUREOVARIEGATA lawsoniana
    Chamaecyparis   NANA AUREOVARIEGATA obtusa
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA Colour
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA thyoides
    Chamaecyparis   SQUARROSA SULPHUREA obtusa
    Chamaecyparis   SQUARROSA SULPHUREA lawsoniana
    Chamaecyparis   SQUARROSA SULPHUREA obtusa
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SUNGOLD Colour
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD thyoides
    Chamaecyparis   SUNGOLD obtusa
    Chamaecyparis   SUNGOLD lawsoniana
    Chamaecyparis   SUNGOLD obtusa
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   TOP POINT   Colour
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   thyoides
    Chamaecyparis   TOP POINT   obtusa
    Chamaecyparis   TOP POINT   lawsoniana
    Chamaecyparis   TOP POINT   obtusa
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TSATSUMI GOLD   Colour
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   thyoides
    Chamaecyparis   TSATSUMI GOLD   obtusa
    Chamaecyparis   TSATSUMI GOLD   lawsoniana
    Chamaecyparis   TSATSUMI GOLD   obtusa
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   NICHOLE Colour
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE thyoides
    Chamaecyparis   NICHOLE obtusa
    Chamaecyparis   NICHOLE lawsoniana
    Chamaecyparis   NICHOLE obtusa
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   RIGID DWARF Colour
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF thyoides
    Chamaecyparis   RIGID DWARF obtusa
    Chamaecyparis   RIGID DWARF lawsoniana
    Chamaecyparis   RIGID DWARF obtusa
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   TRUE BLUE   Colour
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   thyoides
    Chamaecyparis   TRUE BLUE   obtusa
    Chamaecyparis   TRUE BLUE   lawsoniana
    Chamaecyparis   TRUE BLUE   obtusa
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis    Cultivar   Colour
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   thyoides
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   lawsoniana
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis   FILIFERA NANA   Colour
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   FILIFERA NANA   thyoides
    Chamaecyparis   FILIFERA NANA   obtusa
    Chamaecyparis   FILIFERA NANA   lawsoniana
    Chamaecyparis   FILIFERA NANA   obtusa
    Chamaecyparis   FILIFERA NANA   pisifera
    Chamaecyparis   NANA    Colour
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA    thyoides
    Chamaecyparis   NANA    obtusa
    Chamaecyparis   NANA    lawsoniana
    Chamaecyparis   NANA    obtusa
    Chamaecyparis   NANA    pisifera
    Chamaecyparis   NANA AUREOVARIEGATA Colour
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   NANA AUREOVARIEGATA thyoides
    Chamaecyparis   NANA AUREOVARIEGATA obtusa
    Chamaecyparis   NANA AUREOVARIEGATA lawsoniana
    Chamaecyparis   NANA AUREOVARIEGATA obtusa
    Chamaecyparis   NANA AUREOVARIEGATA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA Colour
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SQUARROSA SULPHUREA thyoides
    Chamaecyparis   SQUARROSA SULPHUREA obtusa
    Chamaecyparis   SQUARROSA SULPHUREA lawsoniana
    Chamaecyparis   SQUARROSA SULPHUREA obtusa
    Chamaecyparis   SQUARROSA SULPHUREA pisifera
    Chamaecyparis   SUNGOLD Colour
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   SUNGOLD thyoides
    Chamaecyparis   SUNGOLD obtusa
    Chamaecyparis   SUNGOLD lawsoniana
    Chamaecyparis   SUNGOLD obtusa
    Chamaecyparis   SUNGOLD pisifera
    Chamaecyparis   TOP POINT   Colour
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TOP POINT   thyoides
    Chamaecyparis   TOP POINT   obtusa
    Chamaecyparis   TOP POINT   lawsoniana
    Chamaecyparis   TOP POINT   obtusa
    Chamaecyparis   TOP POINT   pisifera
    Chamaecyparis   TSATSUMI GOLD   Colour
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   TSATSUMI GOLD   thyoides
    Chamaecyparis   TSATSUMI GOLD   obtusa
    Chamaecyparis   TSATSUMI GOLD   lawsoniana
    Chamaecyparis   TSATSUMI GOLD   obtusa
    Chamaecyparis   TSATSUMI GOLD   pisifera
    Chamaecyparis   NICHOLE Colour
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   NICHOLE thyoides
    Chamaecyparis   NICHOLE obtusa
    Chamaecyparis   NICHOLE lawsoniana
    Chamaecyparis   NICHOLE obtusa
    Chamaecyparis   NICHOLE pisifera
    Chamaecyparis   RIGID DWARF Colour
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   RIGID DWARF thyoides
    Chamaecyparis   RIGID DWARF obtusa
    Chamaecyparis   RIGID DWARF lawsoniana
    Chamaecyparis   RIGID DWARF obtusa
    Chamaecyparis   RIGID DWARF pisifera
    Chamaecyparis   TRUE BLUE   Colour
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis   TRUE BLUE   thyoides
    Chamaecyparis   TRUE BLUE   obtusa
    Chamaecyparis   TRUE BLUE   lawsoniana
    Chamaecyparis   TRUE BLUE   obtusa
    Chamaecyparis   TRUE BLUE   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera
    Chamaecyparis    Cultivar   Colour
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis    Cultivar   thyoides
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   lawsoniana
    Chamaecyparis    Cultivar   obtusa
    Chamaecyparis    Cultivar   pisifera
    Chamaecyparis       Colour
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       pisifera
    Chamaecyparis       thyoides
    Chamaecyparis       obtusa
    Chamaecyparis       lawsoniana
    Chamaecyparis       obtusa
    Chamaecyparis       pisifera

Answer 1

您使用第二个cultivar循环搜索整个文档foreach()，而不仅仅是您在第一个genus找到的foreach();对于species

中的cultivar也是如此

但是因为每个条目实际上都在嵌套表中的自己的行中，所以你还需要通过dom回溯每个条目：

foreach($html->find('td.genus') as $a)
foreach($a->parent()->parent()->find('td.cultivar') as $b)
foreach($b->parent()->parent()->find('td.species') as $c)

更好的变量命名也可能使这一点更清晰：

foreach($html->find('td.genus') as $genus) {
    foreach($genus->parent()->parent()->find('td.cultivar') as $cultivar) {
        foreach($cultivar->parent()->parent()->find('td.species') as $species) {
            echo '<tr><td>' . 
                $genus->innertext .
                '</td><td>' .
                $cultivar->innertext .
                '</td><td>' .
                $species->innertext.
                '</td></tr>';
        }
    }
}

Answer 2

检查此解决方案

<?php
    // example of how to use basic selector to retrieve HTML contents
    include('simple_html_dom.php');

    // get DOM from URL or file
    $html = file_get_html('http://www.goldengrovenursery.co.uk/griffin_x/results.asp?txtgenus=Chamaecyparis&txtcultivar=&txtcolour=All&Search=Availability&offset=40');



    echo "<div style='float:left'>";
    foreach($html->find('td.genus') as $genus)

    echo '<div>'.$genus->innertext.'</div>';

     echo "</div><div style='float:left'>";
    foreach($html->find('td.cultivar') as $species)

    echo '<div>'.$species->innertext.'</div>';

    echo '</div><div>';
    foreach($html->find('td.species') as $cultivar)
          echo '<div>'.$cultivar->innertext.'</div>';
            echo '</div>
    ';
    ?>