PHP str_replace()Functions

Examples

Replace the characters "world" in the string "Hello world!" with "Peter":

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

The str_replace() function replaces some characters in a string (case-sensitive).

This function must follow the following rules:

If the searched string is an array, it returns an array.
If the searched string is an array, it will find and replace each element in the array.
If you need to find and replace an array at the same time, and the number of elements to be replaced is less than the number of elements found, the excess elements will be replaced with an empty string.
If you are searching an array but only replacing with one string, the replacement string will apply to all found values.

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

Note:This function is binary-safe.

str_replace(find,replace,string,count)

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

Return value:	Returns a string or array with the replacement values.
PHP Version:	4+
Changelog:	In PHP 5.0, a newcountparameter was added. Before PHP 4.3.3, this function'sfindandreplaceparameters, when both were arrays, would cause trouble, causing emptyfindindices to be ignored when the internal pointer had not been moved toreplacethe array. Newer versions do not have this problem. As of PHP 4.0.5, most parameters can be an array.

Use the str_replace() function 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";
?>

Use the str_replace() function with fewer elements to replace than elements found:

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