PHP4使用者手冊:函數-trim_PHP

手冊

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(PHP 3, PHP 4 >= 4.0.0)

trim -- 去除一個字串開始和結尾的空白

描述

string trim (string str [, string charlist])

注意：第二個參數用在PHP 4.1.0

這個函數返回str字串被去除首尾空白後的新字串。不帶第二個參數trim() 將去除下列字元：

" " (ASCII 32 (0x20)), 空格；

"\t" (ASCII 9 (0x09)), 定位字元；

"\n" (ASCII 10 (0x0A)), 分行符號；

"\r" (ASCII 13 (0x0D)), 斷行符號符；

"\0" (ASCII 0 (0x00)), Null 字元；

"\x0B" (ASCII 11 (0x0B)), 垂直定位字元。

你可以通過charlist參數指定你想去除的字元。Simply list all characters that you want to be stripped. With .. you can specify a range of characters.

例1. trim()例子

$text = "\t\tThese are a few words :) ... ";
$trimmed = trim($text);
// $trimmed = "These are a few words :) ..."
$trimmed = trim($text," \t.");
// $trimmed = "These are a few words :)"
$clean = trim($binary,"\0x00..\0x1F");
// trim the ASCII control characters at the beginning and end of $binary
// (from 0 to 31 inclusive)

?>

參見ltrim()和rtrim().

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