PHP str_replace [英] PHP str_replace

问题描述

我有一个字符串 $var，我需要在其中替换一些文本.第一个X"需要替换为A"，第二个X"需要替换为B，依此类推，示例如下:

I have the string $var in which I need to replace some text. The first "X" needs to be replaced by "A", the second "X" needs to be replaced by B and so on, here is an example:

<?php
$var = "X X X X"; // input
...
echo $var //the result: "A B C D"
?>

我尝试使用 str_replace 但这不起作用.

I tried with str_replace but that doesn't work.

谢谢

推荐答案

你可以使用 preg_replace 的 limit 参数只替换一次.

You could use preg_replace's limit argument to only replace once.

<?php
    $var = 'X X X X';
    $replace = array('A', 'B', 'C', 'D');
    foreach($replace as $r)
        $var = preg_replace('/X/', $r, $var, 1);
    echo $var;
?>

http://codepad.viper-7.com/ra9ulA

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