How to remove the end of string in php

php method to remove the last character of the string: 1. Use the substr function to remove the last character of the string; 2. Use the rtrim function to remove the last character of the string; 3. Use "rtrim($str,$last_char) ;" method removes characters at the end of a string.

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php Remove the characters at the end of the string

$str = '123,234,345,';
echo $str,&#39;<br/>&#39;;
//1、使用substr()函数实现去除字符串末尾字符
echo substr($str,0,-1),&#39;<br/>&#39;;//123,234,345
 
 
//2、使用rtrim()函数实现去除字符串末尾字符
//2.1、已知末尾字符
echo rtrim($str,&#39;,&#39;),&#39;<br/>&#39;;//123,234,345
 
//2.2、不知道末尾字符，需先获取末字符
$last_char=$str{strlen($str)-1}; // &#39;,&#39;
//或者： $last_char=substr($str,-1); // &#39;,&#39;
echo rtrim($str,$last_char);//123,234,345

Supplement:

Several uses of curly braces in php:

//1、 {} 表示程序块的开始和结束：if{} while{} switch(){}等
 
//2、 {}用来表示字符串下标
$str = 'hello';
echo $str[0],&#39;<br>&#39;;// h
echo $str{0},&#39;<br>&#39;;// h
// 在字符串的变量的后面跟上{}花括号和方括号一样都是把某个字符串变量当成数组处理
 
//3、分离变量
$s=&#39;aaa&#39;;
echo "${s}bbb<br/>";//等同于"$s.bbb" => "aaa.bbb" 结果输出：aaabbb
// 防止变量名和后面的字符串合并成一个变量名，变成$aaabbb

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