<?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(jié)果為black green yellow pink purple
  echo "<br>";

  //實例二：數(shù)組的鍵值用字符串替換
  $arr = array("blue","red","green","yellow");
  $str1 = str_replace("red","pink",$arr,$count);
  print_r($str1);
  //輸出結(jié)果
  //Array ( [0] => blue [1] => pink [2] => green [3] => yellow ) 
  echo "<br>" . $count; //輸出替換次數(shù)1

  //實例三：數(shù)組替換數(shù)組，一一映射替換
  $arr1 = array("banana","orange");
  $arr2 = array("pitaya","tomato");
  $con_arr = array("apple","orange","banana","grape");
  $con_rep = str_replace($arr1,$arr2,$con_arr,$count1);
  print_r($con_rep);
  //輸出結(jié)果
  // Array ( [0] => apple [1] => tomato [2] => pitaya [3] => grape ) 
  echo "<br>" . $count1; //輸出替換次數(shù)2

  //實例四：如$search為數(shù)組，$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,$count2);
  print_r($new_arr);
  //輸出結(jié)果
  //Array ( [0] => tomato [1] => apple [2] => orange [3] => tomato ) 
  echo "<br>" . $count2; //輸出替換次數(shù)2
?>

<?php
  	//用法一：strtr(string,from,to)
	echo strtr("I Love you","Lo","lO");
	/*輸出結(jié)果：
	I lOve yOu
	you中的o被替換了，很詭異，要注意可能；
	這種用法也不能被替換為空，不生效；
	不推薦使用該方法*/

	//用法二：strtr(string,array)
	$arr = array("Hello" => "Hi", "world" => "earth");
	echo strtr("Hello world",$arr);
	/*輸出結(jié)果：
	Hi earth*/
?>