How to remove the last few characters in php

In PHP, you can directly use the substr() function to remove the last few characters in reverse order. The syntax format is "substr(string object, 0,-x)". The parameter x is the number of characters that need to be removed; if If successful, the string with the characters removed will be returned. If failed, FALSE will be returned, or an empty string will be returned.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php remove the last few characters

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$str = &#39;123,234,345,&#39;;
echo "原字符串：",$str,&#39;<br/>&#39;;
echo "去掉最后1个字符的字符串：",substr($str,0,-1),&#39;<br/>&#39;;
echo "去掉最后2个字符的字符串：",substr($str,0,-2),&#39;<br/>&#39;;
echo "去掉最后3个字符的字符串：",substr($str,0,-3),&#39;<br/>&#39;;
echo "去掉最后4个字符的字符串：",substr($str,0,-4),&#39;<br/>&#39;;
echo "去掉最后5个字符的字符串：",substr($str,0,-5);
?>

Output:

原字符串：123,234,345,
去掉最后1个字符的字符串：123,234,345
去掉最后2个字符的字符串：123,234,34
去掉最后3个字符的字符串：123,234,3
去掉最后4个字符的字符串：123,234,
去掉最后5个字符的字符串：123,234

Description:

substr() function returns a part of a string. Syntax:

substr(string,start,length)

Parameter	Description
string	Required. Specifies a part of the string to be returned.
start	Required. Specifies where in the string to begin. Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - at the first character in the string Start at
length	Optional. Specifies the length of the string to be returned. The default is until the end of the string. Positive number - Returns from the position of the start parameter Negative number - Returns from the end of the string

Return value: Returns the extracted part of the string, FALSE if failed, or an empty string.

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