PHP4用户手册:函数->trim (转)

PHP4用户手册:函数->trim (转)[@more@]

trim

(PHP 3, PHP 4 >= 4.0.0)

trim -- 去除一个字符串开始和结尾的空白

描述

string trim (string str [, string charlist])

注意：第二个参数用在PHP 4.1.0

这个函数返回str字符串被去除首尾空白后的新字符串。不带第二个参数trim() 将去除下列字符：

• " " (ASCII 32 (0x20)), 空格；

• "t" (ASCII 9 (0x09)), 制表符；

• "n" (ASCII 10 (0x0A)), 换行符；

• "r" (ASCII 13 (0x0D)), 回车符；

• "" (ASCII 0 (0x00)), 空字符；

• "x0B" (ASCII 11 (0x0B)), 垂直制表符。

你可以通过charlist参数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

<?php $text = "ttThese 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,"x00..x1F"); // trim the ASCII control characters at the beginning and end of $binary // (from 0 to 31 inclusive) ?>

参见服务器脚本类/PHP/PHP用户手册/fancy/function.ltrim.html">ltrim()和rtrim().

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