PHP String strripos() Function

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The PHP String strripos() function is a predefined function which is used to find the place of the last occurrence of a string within another string. This function accepts three parameters - string, search and offset. It is case-insensitive unlike the strrpos().

As of PHP 5.0, the search parameter can now be a string of more than one character. The offset argument was added to PHP 5.0

Syntax

Below is the syntax of the PHP String strripos() function −

int strripos ( string $string, string $search, int $offset = 0 )

Parameters

Here are the parameters of the strripos() function −

• $string − (Required) It is used to specify the string to search.

• $search − (Required) It is the string to search.

• $offset − (Optional) It is the specific place where to start the search.

Return Value

The strripos() function returns the position of the last occurrence of a string. Otherwise it returns FALSE. String position starts at 0 and not 1.

Warning

This function may return the Boolean false, but it can also return a non-Boolean value that evaluates to false.

PHP Version

First introduced in core PHP 5, the strripos() function continues to function easily in PHP 7, and PHP 8.

Example 1

First we will show you the basic example of the PHP String strripos() function to find the position of the last occurrence of "Tutorialspoint" inside the given string.

<?php
   echo strripos("I love Tutorialspoint, I love Tutorialspoint too!","Tutorialspoint");
?>

Output

Here is the outcome of the following code −

30

Example 2

In this example we will use the strripos() function and find the last occurrence of "world" which is case-insensitive.

<?php
   // Define string here
   $string = "Hello World, welcome to the programming world!";
   $search = "world";

   // Find the last occurrence of the substring
   $position = strripos($string, $search);

   echo "The last occurrence of '$search' is at position: $position.";
?> 

Output

This will generate the below output −

The last occurrence of 'world' is at position: 40.

Example 3

Now the below code uses strripos() function to handle the case when substring is not found.

<?php
   // Define string here 
   $string = "PHP is a popular scripting language!";
   $search = "Python";

   // Attempt to find the last occurrence
   $position = strripos($string, $search);

   if ($position === false) {
      echo "'$search' was not found in the string.";
   } else {
      echo "The last occurrence of '$search' is at position: $position.";
   }
?> 

Output

This will create the below output −

'Python' was not found in the string.