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；
" " (ASCII 9 (0x09)), 制表符；
"
" (ASCII 10 (0x0A)), 换行符；
"" (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$text = " These are a few words :) ... ";$trimmed = trim($text);// $trimmed = "These are a few words :) ..."$trimmed = trim($text," .");// $trimmed = "These are a few words :)"$clean = trim($binary,"x00..x1F");// trim the ASCII control characters at the beginning and end of $binary// (from 0 to 31 inclusive)?>
参见网站建设服务器脚本类\PHPPHP用户手册fancyfunction.ltrim.html>ltrim()和rtrim().
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