PHP4用戶手冊:函數-trim

trim
(PHP 3, PHP 4 >= 4.0.0)trim — 去除一個字符串開始和結尾的空白 描述
string trim (string str [, string charlist])
註意:第二個參數用在PHP 4.1.0
這個函數返回str字符串被去除首尾空白後的新字符串。不帶第二個參數trim() 將去除下列字符:
” ” (ASCII 32 (0x20)), 空格;
” ” (ASCII 9 (0x09)), 制表符;

” (ASCII 10 (0x0A)), 換行符;
“” (ASCII 13 (0x0D)), 回車符;
“” (ASCII 0 (0x00)), 空字符;
“x0B” (ASCII 11 (0x0B)), 垂直制表符。
你可以通過charlist參數指定你想去除的字符。Simply list all characters that you want to be stripped. With .. you can specify a range of characters.
例1. trim()例子

參見ltrim()和rtrim().

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