Replacing display metadata in bulk for ICC files, from mntrRGB to scnrRGB, requires folders files and final - Mr.Jack

icc_replace.php

<?php
    /*
        Replacing display metadata in bulk for ICC files, from mntrRGB to scnrRGB - Mr.Jack 
    */
    $read_folder = "./files/";
    $write_folder = "./final/";
    
    $scanned_directory = array_diff(scandir($read_folder), array('..', '.'));   
    foreach($scanned_directory as $file){
        echo "<p>Converting ".$file." - ";
        if(!$fp = fopen ($read_folder . $file, 'rb')) return 0;
        if(!$header = fread ($fp, 20)) return 0; //20 bytes header
        $hex_header = unpack ("@12/H16display", $header);

        if($hex_header['display'] === "6d6e747252474220"){ //mntrRGB
            $new_display_mode = "73636e7252474220"; //scnrRGB
            $bin = pack("H*", $new_display_mode); //Hex to Bin

            copy($read_folder . $file, $write_folder . $file);
            if(!$fw = fopen ($write_folder . $file, 'c')) return 0;
            fseek($fw, 12); //skip the first 12 bytes
            fwrite($fw, $bin);
            fclose($fw);
            echo "<strong style='color:green'>Success</strong></p>" . PHP_EOL;
        }else{
            echo "<strong style='color:orange'>Not Match</strong></p>" . PHP_EOL;
        }
        fclose($fp);
    }
    echo "<strong>Done</strong>";