How to remove the last few characters in php

How to remove the last few characters in php: first create a PHP sample file; then define a string; finally remove the last specified characters through the "substr($str,0,-4);" method That’s it.

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<?php    $str=&#39;programming&#39;;        //定义一个字符串
    $res=substr($str,-4);        //处理字符串
    echo "返回{$str}字符串的最后4个字符{$res}";    
    $res=substr($str,0,-4);        //处理字符串
    echo "<br />返回{$str}字符串除去后4个字符{$res}";?>

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