去掉前后逗号的方法:1、用trim()一次性去除字符串两侧的逗号,语法“trim($str,",")”;2、用ltrim()去除字符串开头的逗号,用rtrim()去除末尾的逗号,语法“ltrim(rtrim($str,","),",")”。
本教程操作环境:windows7系统、PHP7.1版、DELL G3电脑
php去掉前后逗号的两种方法
使用trim()
使用ltrim()+rtrim()
1、使用trim()函数
trim() 函数可以一次性移除字符串两侧的逗号
<?php
header('content-type:text/html;charset=utf-8');
$str = ',1,2,3,4,5,6,';
echo trim($str,",");
?>
2、使用ltrim()+rtrim()函数
ltrim()函数可以去除字符串开头的逗号
rtrim()函数可以去除字符串末尾的逗号
<?php
header('content-type:text/html;charset=utf-8');
$str = ',1,2,3,4,5,6,7,8,9,';
echo ltrim($str,",")."<br>";
echo rtrim($str,",")."<br>";
echo ltrim(rtrim($str,","),",");
?>