How to get or delete the last few characters in php

php can use the "substr($str,-N)" statement to get the last character. The parameter "N" specifies the number of characters to be read; to delete the last character, use "rtrim($str,"specified character" )" statement, you can also use the "substr($str,0,-N)" statement. The parameter "N" specifies the number of characters to be deleted.

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

php gets the last few characters

In PHP, you can use the substr() function to read the last few characters of a string.

The substr() function returns a part of a string. Just omit the third parameter of the function and set the second parameter to a negative value (-n), n specifies the last few characters you want to read

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "123456789";
echo "原字符串：".$str."<br>";
echo "读取后1个字符：".substr($str,-1)."<br>";
echo "读取后2个字符：".substr($str,-2)."<br>";
echo "读取后3个字符：".substr($str,-3)."<br>";
?>

php delete the last few characters

1. Use the rtrim() function

rtrim() function can move Except whitespace characters or other predefined characters on the right side of the string.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "123456789";
echo "原字符串：".$str."<br>";
echo "删除后1个字符：".rtrim($str,"9")."<br>";
echo "删除后2个字符：".rtrim($str,"89")."<br>";
echo "删除后3个字符：".rtrim($str,"789")."<br>";
?>

2. Use the substr() function

The substr() function returns a part of the string. Just set the second parameter of the function to 0, and the third parameter to a negative value (-n), where n specifies the last few characters you want to delete.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "123456789";
echo "原字符串：".$str."<br>";
echo "删除后1个字符：".substr($str,0,-1)."<br>";
echo "删除后2个字符：".substr($str,0,-2)."<br>";
echo "删除后3个字符：".substr($str,0,-3)."<br>";
echo "删除后4个字符：".substr($str,0,-4)."<br>";
echo "删除后5个字符：".substr($str,0,-5)."<br>";
?>

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