?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);
?>