PHP Array Exercises : Extension of a file

Last update on May 30 2025 13:14:47 (UTC/GMT +8 hours)

32. Get File Extension

Write a PHP program to get the extension of a file.

Sample Solution:

PHP Code:

<?php
// Define a function named file_extension that takes a file path as an argument
function file_extension($str1){
    // Replace backslashes with an empty string in the given path
    $str1 = implode("", explode("\\", $str1));
    
    // Explode the path using the dot as a delimiter to extract the file extension
    $str1 = explode(".", $str1);
    
    // Convert the file extension to lowercase and return it
    $str1 = strtolower(end($str1));
    
    return $str1;
}

// Define a file path 'example.txt'
$file = 'example.txt';

// Call the file_extension function and display the result
echo "\n" . file_extension($file) . "\n";

?>

Output:

txt

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP function to extract and return the file extension from a given filename string.
Write a PHP script to parse a file path and output the extension after validating its format.
Write a PHP program to implement a regular expression that matches and displays the extension of a file.
Write a PHP function to handle cases with multiple dots in a filename and return the last segment as the extension.

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