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19 years ago
A faster way I've found to return CRC values of larger files, is instead of using the file()/implode() method used below, is to us file_get_contents() (PHP 4 >= 4.3.0) which uses memory mapping techniques if supported by your OS to enhance performance. Here's my example function: 



<?php

// $file is the path to the file you want to check.

function file_crc($file)

{

    $file_string = file_get_contents($file);



    $crc = crc32($file_string);

    

    return sprintf("%u", $crc);

}



$file_to_crc = /home/path/to/file.jpg;



echo file_crc($file_to_crc); // Outputs CRC value for given file.

?>



I've found in testing this method is MUCH faster for larger binary files.
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