How to replace strings in php

How to implement string replacement in php: first create a PHP sample file; then replace the string through the "str_replace("red","black","red green yellow pink purple");" method; Finally, the replacement result can be output through echo.

The operating environment of this tutorial: Windows 7 system, PHP version 5.6. This method is suitable for all brands of computers.

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PHP string replacement str_replace() function four usages

Parameters $search, the string or array to be replaced

Parameter $replace, the string or array to be replaced

Parameter $subject, the string or array to be queried

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

Return value: This function returns the replaced array or string (newly generated)

Example 1: String replaces string

  $str1 = str_replace("red","black","red green yellow pink purple");
  echo $str1."";  
  //输出结果为black green yellow pink purple

Example 2: String replaces array key value

  $arr = array("blue","red","green","yellow");
  $str1 = str_replace("red","pink",$arr,$i);
  print_r($str1);

Example 3: Array replaces array, mapping replaces

  $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);

Example 4 : If $search is an array and $replace is a string

  $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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