String processing-PHP character replacement

Directly run the code {code...}. Shouldn't the result be 0Handler1TestHandler. php? Is there a problem? Run the Code directly.

$str = '\Handler\TestHandler.php';$need = ['\\', '\\'];$new_need = [0,1];$result = str_replace($need, $new_need, $str);//$result=>0Handler0TestHandler.php

The result should not be0Handler1TestHandler.php?

Is there a problem?

Reply content:

Run the Code directly.

$str = '\Handler\TestHandler.php';$need = ['\\', '\\'];$new_need = [0,1];$result = str_replace($need, $new_need, $str);//$result=>0Handler0TestHandler.php

The result should not be0Handler1TestHandler.php?

Is there a problem?

Your two\All are replaced by 0. Syntax details

Php should not have this built-in method. You need to write a function by yourself. The following should be able to implement your function.

function replace ($str) {    $i = 0;    $result = '';    $arr = explode("\\", $str);    foreach ($arr as $val) {        if ($val === '') continue;        $result .= ($i++).$val;    }    return $result;}

Because array replacement is a successive replacement, the first replacement has already replaced two\If it is replaced with 0, the replacement will not match.\No.