PHP function to calculate the MD5 checksum of a file

Last update on December 20 2024 10:27:24 (UTC/GMT +8 hours)

Write a PHP function to calculate the MD5 checksum of a file.

Sample Solution:

PHP Code :

<?php
function calculateFileChecksum($filename) {
    try {
        if (!file_exists($filename)) {
            throw new Exception("File does not exist.");
        }

        $checksum = md5_file($filename);

        if ($checksum === false) {
            throw new Exception("Error calculating MD5 checksum.");
        }

        return $checksum;
    } catch (Exception $e) {
        echo "An error occurred: " . $e->getMessage();
    }
}

// Usage:
$filename = "i:/test.txt";
$checksum = calculateFileChecksum($filename);

echo "MD5 Checksum: " . $checksum . "\n";
?>

Sample Output:

MD5 Checksum: 4271622bc79aba1829f5612e0400a034

Explanation:

In the above exercise -

The function calculateFileChecksum($filename) takes the filename as input.
First, we check if the file exists using file_exists(). If the file does not exist, we throw an exception with the error message "File does not exist."
We then use the md5_file() function to calculate the MD5 checksum of the file. This function reads the file contents and computes the MD5 hash value.
If there is an error calculating the MD5 checksum, we throw an exception with the error message "Error calculating MD5 checksum."
Finally, we return the computed MD5 checksum from the function.

Flowchart:

PHP Code Editor:

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