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

Syntax

str_replace(find,replace,string,count)

Parameter	Description
find	Required. Specifies the value to find
replace	Required. Specifies the value to replace the value in find
string	Required. Specifies the string to be searched
count	Optional. A variable that counts the number of replacements

Tips and Notes

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

Note: This function is binary-safe.

<?php
echo str_replace("world","Peter","Hello world!");
?>

The output of the code above will be:

Hello Peter!

In this example we will demonstrate str_replace() with an array and a count variable:

<?php
$arr = array("blue","red","green","yellow");
print_r(str_replace("red","pink",$arr,$i));
echo "Replacements: $i";
?>

The output of the code above will be:

Array
(
[0] => blue
[1] => pink
[2] => green
[3] => yellow
)
Replacements: 1

In this example we will demonstrate str_replace() with less elements in replace than find:

<?php
$find = array("Hello","world");
$replace = array("B");
$arr = array("Hello","world","!");
print_r(str_replace($find,$replace,$arr));
?>

The output of the code above will be:

Array
(
[0] => B
[1] =>
[2] => !
)

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