PHP strrpos() Function

In this chapter you will learn:

Definition for PHP strrpos() Function
Syntax for PHP strrpos() Function
Parameter for PHP strrpos() Function
Return for PHP strrpos() Function
Related functions for PHP strrpos() Function
Example - Find the position of the last occurrence of "php" inside the string
Example - deal with the starting index

Definition

The strrpos() function finds the position of the last occurrence of a string inside another string (case-sensitive).

Syntax

PHP strrpos() Function has the following syntax.

strrpos(string,find,start)

Parameter

Parameter	Is Required	Description
string	Required.	String to search
find	Required.	String to find
start	Optional.	Where to begin the search

Return

PHP strrpos() Function returns the position of the last occurrence of a string inside another string, or FALSE if the string is not found.

Related functions

strpos() - Finds the position of the first occurrence of a string inside another string (case-sensitive)
stripos() - Finds the position of the first occurrence of a string inside another string (case-insensitive)
strripos() - Finds the position of the last occurrence of a string inside another string (case-insensitive)

Example 1

Find the position of the last occurrence of "php" inside the string:


<?php//from   j  av a2 s. c  om
echo strrpos("php, from java2s.com!","php");

$myString = "Hello, world!"; 
echo strpos( $myString, "o" ) . "\n";  // Displays '4' 
echo strrpos( $myString, "o" ) . "\n"; // Displays '8'   
?>

The code above generates the following result.

Example

When the searched text occurs at the start of the string. In this case, strpos() returns 0 (the index of the first character of the found text), but it's easy to mistake this for a return value of false if you're not careful.

For example, the following code will incorrectly display "Not found" :


<?PHP//from  ja  va2  s  .  c  om
   $myString = "Hello, world!"; 
   if ( !strrpos( $myString, "Hel" ) ) {
      echo "Not found";   
   }   
?>

So you need to test explicitly for a false return value, if that's what you're checking for.

The following code works correctly:


<?PHP//from ja  v  a  2  s . c o m
   $myString = "Hello, world!"; 
   if ( strrpos( $myString, "Hel" ) === false ){
       echo "Not found";   
   }
?>