Question

我是php新手并尝试使用preg_match_all

从url中提取数据

问题是匹配被转换为字符串而我无法单独提取

<?php
$pattern = '/<span class="product".*/i';
$string = file_get_contents('http://www.example.com/');

preg_match_all($pattern, $string, $matches);
echo 'preg_match_all()';
echo '<pre>';
echo ' Products: ', var_dump($matches);
echo '</pre>';

返回

preg_match_all()

Products: array(1) {
  [0]=> array(7) {
      [0] => string(46) "Product 1"
      [1] => string(42) "Product 2"
      [2] => string(46) "Product 3"
      [3] => string(41) "Product 4"
      [4] => string(58) "Product 5"
      [5] => string(42) "Product 6"
      [6] => string(37) "Product 7"
  }
}

我试图一次提取1个项目（即单独的元素），并在可能的情况下将每个项目放入自己的变量中。示例：$ product1 =“Product 1”

如果我尝试echo $matches[2];来获得产品3，我会得到一个未定义的偏移误差

修改

在此主题的帮助下：Retrieve data contained a certain span class

解决方案：

<?php
$html=file_get_contents('http://www.example.com/');
preg_match_all("/\(.*?)\<\/span\>/",$html,$b);

foreach($b as $key => $value) {
$$key = $value;
}

echo $value[4]; // Returns 4th key, or "Product 5"

是的，我在格式化代码时非常糟糕

Answer 1

$markup = '<span class="Products-Name">Used Gibson USA</span>
    <span class="Products-Discription">Les Test Test Test Paul Custom 1986
    <br />with Factory Kahler </span>';
$markup = preg_replace('~<br\\s*/?>~si', ' ', $markup); // replace <br> with space
$markup = preg_replace('~\\s+~', ' ', $markup); // compact consecutive spaces into a single space
if(preg_match_all('~<span class="Products-(.+?)">(.*?)</span>~si', $markup, $matches)){
    // trim the enite deep array
    array_walk_recursive($matches, function(&$match){
        $match = trim($match);
    });
    // this shows you how the $matches is structured
    list($raw_matches, $class_matches, $inner_matches) = $matches;
    // combine class names with span inner value
    var_dump(array_combine($matches[1], $matches[2]));
}
// this is how you loop preg_match_all() results
foreach($matches[0] as $key => $raw_match){
    $class_match = $matches[1][$key];
    $inner_match = $matches[2][$key];
    if(!strcasecmp($class_match, 'what YOU seek')){
        echo $inner_match;
    }
}

从匹配中提取字符串

1 个答案: