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HomeBackend DevelopmentPHP ProblemHow to remove the last comma in php

php删除最后一个逗号的方法:首先创建一个PHP示例文件;然后定义一个末尾带有逗号的字符串;最后通过“rtrim($str, ",");”方法删除最后一个逗号即可。

How to remove the last comma in php

本文操作环境:windows7系统、PHP7.1版,DELL G3电脑

去除最后一个逗号:

$str = "a,b,c,d,";
echo rtrim($str, ",");

返回的结果就是:

a,b,c,d

rtrim() 函数

rtrim() 函数移除字符串右侧的空白字符或其他预定义字符。

相关函数:

ltrim() - 移除字符串左侧的空白字符或其他预定义字符

trim() - 移除字符串两侧的空白字符或其他预定义字符

语法

rtrim(string,charlist)

参数 

string 必需。规定要检查的字符串。

charlist

可选。规定从字符串中删除哪些字符。如果省略,则移除下列所有字符:

"\0" - NULL
"\t" - 制表符
"\n" - 换行
"\x0B" - 垂直制表符
"\r" - 回车
" " - 空格

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