Question

我正在尝试从该字符串中获取href，但是我不能，因为它在链接中有空格。我尝试通过正则表达式来做，但是我不是正则表达式方面的专家。我尝试使用互联网上的示例，但没有得到应有的价值。

<table class="grid border" cellspacing="0" border="0" id="ctl00_ContentBody_grvStudentResult" style="width:100%;border-collapse:collapse;">
<tbody>
    <tr>
        <th align="left" valign="middle" scope="col">Code</th>
        <th align="left" valign="middle" scope="col">Subject</th>
        <th align="left" valign="middle" scope="col">Status</th>
        <th align="center" valign="middle" scope="col">Score</th>
        <th align="center" valign="middle" scope="col">Result Date</th>
    </tr>
    <tr class="detail1">
        <td align="left" valign="middle">
            DipPM15PQ
        </td>
        <td align="left" valign="middle">
            <span class="">
            1561|
            <a onclick="return hs.htmlExpand( this, {  objectType: 'iframe', width: 800, height: 600,  outlineWhileAnimating: true, preserveContent: false } )" href="DetailResults.aspx?sid=90651&amp;id=1769095&amp;nsub= [Project Quality] &amp;Subjectid=1561" title="Approved "> 
            <img alt="" style="display: online" src="../Images/Common/r_Approved.gif" border="0">
            [Project Quality]   </a>
            </span>
            <span class="selected">
            </span>
        </td>
        <td align="left" valign="middle">
            <span class="enable">
            Competent
            </span>
            <center style="display: none">
                <span disabled="disabled"><input id="ctl00_ContentBody_grvStudentResult_ctl02_chkAP" type="checkbox" name="ctl00$ContentBody$grvStudentResult$ctl02$chkAP" checked="checked" disabled="disabled"><label for="ctl00_ContentBody_grvStudentResult_ctl02_chkAP"> </label></span>
            </center>
        </td>
        <td align="center" valign="middle">
            75.00
        </td>
        <td align="center" valign="middle">
            11/11/2018
        </td>
    </tr>
    <tr class="detail1">
        <td align="left" valign="middle">
            DipPM15PC
        </td>
        <td align="left" valign="middle">
            <span class="">
            1559|
            <a onclick="return hs.htmlExpand( this, {  objectType: 'iframe', width: 800, height: 600,  outlineWhileAnimating: true, preserveContent: false } )" href="DetailResults.aspx?sid=90898&amp;id=1769088&amp;nsub= [Project Costs] &amp;Subjectid=1559" title="NAN "> 
            <img alt="" style="display: online" src="../Images/Common/r_.gif" border="0">
            [Project Costs]   </a>
            </span>
            <span class="selected">
            [progress]
            </span>
        </td>
        <td align="left" valign="middle">
            <span class="disable">
            </span>
            <center style="display: none">
            </center>
        </td>
        <td align="center" valign="middle">
        </td>
        <td align="center" valign="middle">
        </td>
    </tr>
</tbody>

Answer 1

解析HTML的更好方法是使用DOMDocument。您可以使用它来处理HTML，并从HTML中的所有hrefs标签中找到<a>。我假设您的HTML位于名为$html的变量中：

$doc = new DOMDocument();
$doc->loadHTML($html);
$anchors = $doc->getElementsByTagName('a');
foreach ($anchors as $a) {
    $urls[] = $a->attributes->getNamedItem('href')->nodeValue . "\n";
}
foreach ($urls as $url) {
    echo $url;
}

输出

DetailResults.aspx?sid=90651&id=1769095&nsub= [Project Quality] &Subjectid=1561 
DetailResults.aspx?sid=90898&id=1769088&nsub= [Project Costs] &Subjectid=1559

Demo on 3v4l.org

如果您必须使用正则表达式，那么它将适用于您的示例数据：

preg_match_all('/href="([^"]+)/', $html, $matches);
print_r($matches[1]);

输出：

Array ( 
    [0] => DetailResults.aspx?sid=90651&amp;id=1769095&amp;nsub= [Project Quality] &amp;Subjectid=1561
    [1] => DetailResults.aspx?sid=90898&amp;id=1769088&amp;nsub= [Project Costs] &amp;Subjectid=1559 
)

Demo on 3v4l.org

Answer 2

我不是专家，但这对我有用

$string ='<a onclick="return hs.htmlExpand( this, {  objectType: \'iframe\', width: 800, height: 600,  outlineWhileAnimating: true, preserveContent: false } )" href="DetailResults.aspx?sid=90651&amp;id=1769095&amp;nsub= [Project Quality] &amp;Subjectid=1561" title="Approved "> 
            <img alt="" style="display: online" src="../Images/Common/r_Approved.gif" border="0">
            [Project Quality]   </a>';
preg_match_all( '~<a .*?href=[\'"](.*?)[\'"].*?>~', $string, $match );

$urls=array();//array of link
foreach($match as $m){
 if (isset($m[0])) {
    $url[]= $m[0];
}}

如何从字符串获取href值

2 个答案: