Question

我想从字符串中提取一些数据（实际上是HTML）。我搜索了一下，找到了preg_match_all。问题是如果有两个相等的匹配，则该函数将它们视为两个并为两者创造空间。我的代码，代码的输出和代码的预期输出将清楚地解释。

<?php
    $html = "
        <!doctype html>
        <html lang=\"en\">
        <head>
            <meta charset=\"UTF-8\">
            <title>Document</title>
        </head>
        <body>
            <img src=\"[profileLink@user:0]\" />
            <img src=\"[profileLink@user:0]\" />
        </body>
        </html>
    ";
    $regex = "/\[(.*?)@(.*?)\]/";
    preg_match_all($regex, $html, $matches);
    var_dump($matches);
?>

输出：

array (size=3)
  0 => 
    array (size=2)
      0 => string '[profileLink@user:0]' (length=20) // It looks ok
      1 => string '[profileLink@user:0]' (length=20) // Don't want it.
  1 => 
    array (size=2)
      0 => string 'profileLink' (length=11) // It looks ok
      1 => string 'profileLink' (length=11) // Don't want it.
  2 => 
    array (size=2)
      0 => string 'user:0' (length=6) // It looks ok
      1 => string 'user:0' (length=6) // Don't want it.

预期输出：

array (size=3)
  0 => 
    array (size=1)
      0 => string '[profileLink@user:0]' (length=20)
  1 => 
    array (size=1)
      0 => string 'profileLink' (length=11)
  2 => 
    array (size=1)
      0 => string 'user:0' (length=6)

Answer 1

使用preg_match代替preg_match_all，结果将是：

array(3) {
  [0]=>
  string(20) "[profileLink@user:0]"
  [1]=>
  string(11) "profileLink"
  [2]=>
  string(6) "user:0"
}

PHP：preg_match_all将两个相等的匹配视为一个

1 个答案: