PHP str_replace() Function

Definition and Usage

The str_replace() function replaces some characters with some other characters in a string.

This function works by the following rules:

  • If the string to be searched is an array, it returns an array
  • If the string to be searched is an array, find and replace is performed with every array element
  • If both find and replace are arrays, and replace has fewer elements than find, an empty string will be used as replace
  • If find is an array and replace is a string, the replace string will be used for every find value

Note: This function is case-sensitive. Use the str_ireplace() function to perform a case-insensitive search.

Note: This function is binary-safe.




findRequired. Specifies the value to find
replaceRequired. Specifies the value to replace the value in find
stringRequired. Specifies the string to be searched
countOptional. A variable that counts the number of replacements

Technical Details

Return Value:Returns a string or an array with the replaced values
PHP Version:4+
Changelog:The count parameter was added in PHP 5.0

Before PHP 4.3.3, this function experienced trouble when using arrays as both find andreplace parameters, which caused empty find indexes to be skipped without advancing the internal pointer on the replace array. Newer versions will not have this problem.

As of PHP 4.0.5, most of the parameters can now be an array


Example 1

Using str_replace() with an array and a count variable:

$arr = array("blue","red","green","yellow");
echo "Replacements: $i";


Example 2

Using str_replace() with less elements in replace than find:

$find = array("Hello","world");
$replace = array("B");
$arr = array("Hello","world","!");


asked Aug 28, 2015 in PHP by rajesh
0 votes

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