PHP正则表达式精确url匹配，更改img src

Question

我有一个 HTML 文档，标签中包含一些图像。我想用不同的、在数组中定义的值更改每个 img 源（src）。

当我运行以下代码时，我得到了

Warning: preg_replace(): Unknown modifier '/' in /var/www/test.php on line 9
Warning: preg_replace(): Unknown modifier '/' in /var/www/test.php on line 9

How do I escape the url strings permanent?

<?php
$body = "<img src=http://www.google.com/img1.jpg><br>"
      + "<img width=300 src=http://www.bbc.co.uk/img1.jpg>";

$changes = array();
$changes[] = array('from' => 'http://www.google.com/img1.jpg',
                     'to' => 'http://cnn.com/image2.jpg');
$changes[] = array('from' => 'http://www.bbc.co.uk/img1.jpg',
                     'to' => 'http://www.foo.bar.com/image2.jpg');

foreach ($changes as $change){
    $body = preg_replace('/<(img.*src)="'.$change['from'].'".*\/?>/',
                         '<\1="'.$change['to'].'">', $body)
            . PHP_EOL;
}
?>

Answer 1

试试这个：

http://php.net/manual/en/function.urlencode.php< /a> 用于编码 url。

但是，看起来您只是想替换 $body 中的字符串的一部分，所以我会使用

http://php.net/manual/en/function.str-replace.php

而不是您的正则表达式。

<?php
$body = "<img src=http://www.google.com/img1.jpg><br><img width=300 src=http://www.bbc.co.uk/img1.jpg>";

$changes = array();
$changes[] = array('from' => 'http://www.google.com/img1.jpg', 'to'=> 'http://cnn.com/image2.jpg');
$changes[] = array('from' => 'http://www.bbc.co.uk/img1.jpg', 'to' => 'http://www.foo.bar.com/image2.jpg');

foreach ($changes as $change){
$body = str_replace($change['from'],$change['to'],$body);
}
?>