PHP字元過濾函數去除字串最後一個逗號(rtrim)_php技巧

首先分別解釋下,

trim過濾字串兩端,
rtrim過濾字串尾部,=chop()
ltrim過濾字串首部.

過濾字串中鍵的咚咚就只能用str_replace咯.
舉個例子說明下,

PHP代碼

複製代碼 代碼如下:

$str = '123,333,234,';
echo rtrim($str, ',');

rtrim執行個體代碼2

複製代碼 代碼如下:

<?php
$text = "\t\tThese are a few words :) ...  ";
$trimmed = rtrim($text);
// $trimmed = "\t\tThese are a few words :) ..."
$trimmed = rtrim($text, " \t.");
// $trimmed = "\t\tThese are a few words :)"
$clean = rtrim($binary, "\x00..\x1F");
// trim the ASCII control characters at the end of $binary
// (from 0 to 31 inclusive)
?>