(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；
"\0" (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 = "\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) ?>
参见ltrim()和rtrim().
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