What is PHP | strtr() for replacing substrings?

In this article, we will learn PHP | strtr() for replacing substrings,This free PHP tutorial for complete beginners will help you learn PHP from scratch.

PHP | strtr() for replacing substrings - ❤️PHP Tutorials In 2024

It replaces given substring in a string with another given string. We can also use it to do multiple replacements by passing an array of pairs.

Examples:

Input : $str = "Hmrrb GmmksfbrGmmks";
        $from = "rbm";
        $to = "loe";
Output : Hello w3wiki

Input : $str = "Hello world";
        $arr = array("Hello" => "I Love", "world" => "w3wiki");
Output : I Love w3wiki

Syntax :

string strtr ( string $string, string $from, string $to)

OR

string strtr (string $string, array $from_to_pairs)

Parameters :This function accepts three/two parameters and all of them are mandatory to be passed.
   Syntax 1 :
      1. $string: This parameter represents the given input string.
      2. $from: This parameter represents the sub string that is to be translated.
      3. $to: This parameter represents the translated sub string of “from” sub string.
   Syntax 2 :
      1. $string: This parameter represents the given input string.
      2. $translating_pairs: This parameter represents the array containing respective From-to pairs.

Return Value :This function returns a string in which all the characters of from sub string are replaced by to sub string in the given string.

Note that, if from and to have different lengths, then output will be co-related with that of the shortest.
Below programs illustrates the strtr() function in PHP:

Program 1 :

<?php 
   
// original string 
$str = "GzzksworGzzks is zverything."; 
   
// from and to terms 
$from = "zw"; 
$to = "ef"; 
  
// calling strtr() function 
$resStr = strtr($str, $from, $to); 
   
print_r($resStr); 
   
?> 

Output :

w3wiki is everything.

Program 2 :

<?php 
   
// original string 
$str = "Hi there"; 
   
// array declaring from-to pairs 
$arr = array("Hi" => "Be", "there" => "Happy"); 
  
// calling strtr() function 
$resStr = strtr($str, $arr); 
   
print_r($resStr); 
   
?> 

Output :

Be Happy

Reference : http://php.net/manual/en/function.strtr.php