php去除字符串两边的逗号的方法：首先使用rtrim($str, ",")方法去除字符串末尾的逗号；然后使用ltrim($str, ",")方法去除字符串开头的逗号即可。
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PHP去除字符串开头或末尾逗号
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
去除开头逗号：
$str = ",a,b,c,d";
echo ltrim($str, ",");返回的结果就是：a,b,c,d
用到的函数：
trim() 函数从字符串的两端删除空白字符和其他预定义字符。
trim(string,charlist)
string 必需。规定要检查的字符串。
charlist 可选。规定要转换的字符串。如果省略该参数，则删除以下所有字符：
"\0" - NULL
"\t" - tab
"\n" - new line
"\x0B" - 纵向列表符
"\r" - 回车
" " - 普通空白字符rtrim() 函数从字符串的末端开始删除空白字符或其他预定义字符。
string 必需。规定要转换的字符串。
charlist 可选。规定从字符串中删除哪些字符。如果未设置该参数，则全部删除以下字符：
"\0" - ASCII 0, NULL
"\t" - ASCII 9, 制表符
"\n" - ASCII 10, 新行
"\x0B" - ASCII 11, 垂直制表符
"\r" - ASCII 13, 回车
" " - ASCII 32, 空格ltrim() 函数从字符串左侧删除空格或其他预定义字符。
string 必需。规定要转换的字符串。
charlist 可选。规定从字符串中删除哪些字符。如果未设置该参数，则全部删除以下字符：
"\0" - ASCII 0, NULL
"\t" - ASCII 9, 制表符
"\n" - ASCII 10, 新行
"\x0B" - ASCII 11, 垂直制表符
"\r" - ASCII 13, 回车
" " - ASCII 32, 空格The above is the detailed content of How to remove commas from both sides of a string in php. For more information, please follow other related articles on the PHP Chinese website!
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