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php字串置換的問題

May 23rd 2013, 03:12

我有一段程式碼

$test="123456A";

想要做到以下的輸出
A123456

我有上網找到取得最後一個字方方法
$test=mb_substr($test,-1,1);

但是後面就不會了....我接下來應該要怎麼做呢才達到A放在最前面但後面又不消失呢??我知道可以用mb_substr($test,1,6);但是這樣變成每次我改字串內容程式碼就要跟著變....有沒有甚麼方法可以辦到呢??

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