What function does php use to replace a string?

Let me share with you the PHP string replacement str_replace() function4 usages through this article. 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 (recommended learning: PHP Programming from Beginner to Mastery)

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

3, $subject, the string or array to be queried

4, $count, optional, if specified, will be set to replace Number of times

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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