PHP trim()函数详解

定义

trim - 去除字符串里的空白符及其余指定字符

Strip whitespace (or other characters) from the beginning and end of a string

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描述

trim ( string $str [, string $character_mask = " \t\n\r\0\x0B" ] ) : string

参数 character_mask 可指定任意字符，使用..可指定一个范围
默认去除下面五个字符

• " " (ASCII 32 (0x20)), an ordinary space - 普通空白符.
• "\t" (ASCII 9 (0x09)), a tab - 制表符.
• "\n" (ASCII 10 (0x0A)), a new line (line feed) - 换行符.
• "\r" (ASCII 13 (0x0D)), a carriage return - 回车符.
• "\0" (ASCII 0 (0x00)), the NUL-byte.
• "\x0B" (ASCII 11 (0x0B)), a vertical tab - 垂直制表符.

示例

trim($text, " \t.");
trim($hello, "Hdle");
// (from 0 to 31 inclusive)
trim($binary, "\x00..\x1F");

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参看

相似函数，ltrim(),rtrim()