PHP trim()函数详解

定义

trim - 去除字符串里的空白符及其他指定字符

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

---

描述

trim ( string $str [, string $character_mask = " 	

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.
• " " (ASCII 9 (0x09)), a tab - 制表符.
• " " (ASCII 10 (0x0A)), a new line (line feed) - 换行符.
• " " (ASCII 13 (0x0D)), a carriage return - 回车符.
• "" (ASCII 0 (0x00)), the NUL-byte.
• "x0B" (ASCII 11 (0x0B)), a vertical tab - 垂直制表符.

示例

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

---

参看

类似函数，ltrim(),rtrim()

---