What are the methods of php string replacement str_replace() function? (four types)

What this article brings to you is what are the methods of replacing str_replace() function in PHP strings? (Four types) have certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

This article will share with you 4 ways to use the PHP string replacement str_replace() function. The specific content is as follows:

mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )

This function returns a string or array. This string or array is the result of replacing all searches in the subject with replace.

1. $search, the string or array to be replaced

2. $replace, the string or array to be replaced

3. $subject, The string or array being queried

4. $count, optional, if specified, will be set to the number of replacements

5. Return value: This function returns the replaced array Or string (newly generated)

<?php

  //实例一：字符串替换字符串

  $str1 = str_replace("red","black","red green yellow pink purple");

  echo $str1."";  //输出结果为black green yellow pink purple

?>

<?php

  //实例二：字符串替换数组键值

  $arr = array("blue","red","green","yellow");

  $str1 = str_replace("red","pink",$arr,$i);

  print_r($str1);

?>

<?php

  //实例三：数组替换数组，映射替换

  $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

  //实例四：如$search为数组，$replace为字符串时

  $search = array("banana","grape");

  $replace = "tomato";

  $arr = array("banana","apple","orange","grape");

  $new_arr = str_replace($search,$replace,$arr,$count);

  print_r($new_arr);

?>

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