PHP preg_replace()函數(shù)

    函數(shù)語法：

    mixed preg_replace (mixed pattern, mixed replacement, mixed subject [,int limit])

    函數(shù)功能：該函數(shù)在字符串subject中匹配表達式pattern，并將匹配項替換成字串replacement。如果有參數(shù)limit，則替換limit次。