首先分別解釋下,

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

過濾字符串中鍵的咚咚就只能用str_replace咯.
舉個例子說明下,

php代碼
復制代碼 代碼如下:
$str = '123,333,234,';
echo rtrim($str, ',');

rtrim實例代碼2
復制代碼 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)
?>

php技術：PHP字符過濾函數去除字符串最后一個逗號(rtrim)，轉載需保留來源！

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