How to replace a word inside a string in PHP ?

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Given a string containing some words and the task is to replace all the occurrences of a word within the given string str in PHP. In order to do this task, we have the following methods in PHP:

Method 1: Using str_replace() Method: The str_replace() method is used to replace all the occurrences of the word W1 by replacing word W2 in the given string str.

Syntax:

str_replace( $searchVal, $replaceVal, $subjectVal, $count )

Example:

PHP

<?php
// PHP program to replace all occurrence
// of a word inside a string
   
// Given string
$str = "zambiatek for Geeks"; 
 
// Word to be replaced
$w1 = "zambiatek";
 
//  Replaced by
$w2 = "GEEKS";
   
// Using str_replace() function 
// to replace the word 
$str = str_replace($w1, $w2, $str);
 
// Printing the result
echo $str; 
?>

Output

GEEKS for Geeks

Method 2: Using str_ireplace() Method: The str_ireplace() method is used to replace all the occurrences of the word W1 by replacing word W2 in the given string str. The difference between str_replace() and str_ireplace() is that str_ireplace() is a case-insensitive.

Syntax:

str_ireplace( $searchVal, $replaceVal, $subjectVal, $count )

Example:

PHP

<?php
// PHP program to replace 
// a word inside a string
   
// Given string
$str = "zambiatek for Geeks"; 
 
// Word to be replaced
$w1 = "zambiatek";
 
//  Replaced by
$w2 = "GEEKS";
   
// Using str_ireplace() function 
// replace the word 
$str = str_ireplace($w1, $w2, $str);
 
// Printing the result
echo $str; 
?>

Output

GEEKS for GEEKS

Method 3: Using preg_replace() Method: The preg_replace() method is used to perform a regular expression for search and replace the content.

Syntax:

preg_replace( $pattern, $replacement, $subject, $limit, $count )

Example:

PHP

<?php
// PHP program to replace 
// a word inside a string
   
// Given string
$str = "zambiatek for Geeks"; 
 
// Word to be replaced
$w1 = "zambiatek";
 
//  Replaced by
$w2 = "GEEKS";
   
// Using preg_replace() function 
// to replace the word 
 
$str = preg_replace('/bzambiatekb/',$w2, $str);
 
// Printing the result
echo $str; 
?>