Question

我在努力更换每个链接中的文字。

$reg_ex = "/(http|https)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

$text = '<br /><p>this is a content with a link we are supposed to <a href="http://www.google.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.amazon.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.wow.com">click</a></p>';

if(preg_match_all($reg_ex, $text, $urls))
{

    foreach($urls[0] as $url)
    {

        echo $replace = str_replace($url,'http://www.sometext'.$url,  $text);
    }

}

从上面的代码中，我得到相同文本的3倍，并且逐个更改链接：每次只更换一个链接 - 因为我使用foreach，我知道。但我不知道如何立即更换它们。你的帮助会很棒！

Answer 1

你不能在html上使用正则表达式。请改用DOM。话虽这么说，你的错误就在这里：

$replace = str_replace(...., $text);
^^^^^^^^---                  ^^^^^---

你永远不会更新$ text，所以你不断在循环的每次迭代中删除替换。你可能想要

$text = str_replace(...., $text);

相反，所以更改＆＃34;传播＆＃34;

Answer 2

如果你想让最后一个变量包含所有的替换，那就改变它吧...... 你基本上没有将被替换的字符串传回“主题”。我认为这是你所期待的，因为理解这个问题有点困难。

$reg_ex = "/(http|https)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

$text = '<br /><p>this is a content with a link we are supposed to <a href="http://www.google.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.amazon.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.wow.com">click</a></p>';

if(preg_match_all($reg_ex, $text, $urls))
{
    $replace = $text;
    foreach($urls[0] as $url) {

        $replace = str_replace($url,'http://www.sometext'.$url,  $replace);
    }

    echo $replace;
}

用另一个替换链接

2 个答案: