<?php  //實例一：字符串替換字符串  $str1 = str_replace("red","black","red green yellow pink purple");  echo $str1."";  //輸出結果為black green yellow pink purple?><?php  //實例二：字符串替換數組鍵值  $arr = array("blue","red","green","yellow");  $str1 = str_replace("red","pink",$arr,$i);  print_r($str1);?><?php  //實例三：數組替換數組，映射替換  $arr1 = array("banana","orange");  $arr2 = array("pitaya","tomato");  $con_arr = array("apple","orange","banana","grape");  $con_rep = str_replace($arr1,$arr2,$con_arr,$count);  print_r($con_rep);?><?php  //實例四：如$search為數組，$replace為字符串時  $search = array("banana","grape");  $replace = "tomato";  $arr = array("banana","apple","orange","grape");  $new_arr = str_replace($search,$replace,$arr,$count);  print_r($new_arr);?>