假設有一個字串" ddd dd d "，經過Trim()之後成為"ddd dd d".
如上可以去掉兩邊多餘的空格（包括定位字元）,但不能去掉中間的空格.
PHP中的trim()函數跟ASP中的trim()函數用法一樣的,如果你接觸過ASP,那麼就自然會用的.
用法比較簡單,在想要去掉空格的變數中加入如下:
<?php
echo trim($變數);
?>
一般用到使用者的password處理中。
定義和用法
trim() 函數從字串的兩端刪除空白字元和其他預定義字元。
文法
trim(string,charlist)參數 描述
string 必需。規定要檢查的字串。
charlist 可選。規定要轉換的字串。如果省略該參數，則刪除以下所有字元：
"\0" - NULL
"\t" - tab
"\n" - new line
"\x0B" - 縱向列表符
"\r" - 斷行符號
" " - 普通空白字元
例子 1 複製代碼 代碼如下:<html>
<body>
<?php
$str = " Hello World! ";
echo "Without trim: " . $str;
echo "<br />";
echo "With trim: " . trim($str);
?>
<body>
<html>
輸出： 複製代碼 代碼如下:Without trim: Hello World!
With trim: Hello World!HTML 源碼：
例子 2
複製代碼 代碼如下:<?php
$str = "\r\nHello World!\r\n";
echo "Without trim: " . $str;
echo "<br />";
echo "With trim: " . trim($str);
?>
輸出：
Without trim: Hello World!
With trim: Hello World!HTML
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