trim

(PHP 3, PHP 4 >= 4.0.0)

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.

<?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().