Store multiple images on server

images.php

// snippet for blog post 
// http://btools.eu/read/2013/how-to-store-multiple-images-or-documents-on-server/

<?php

//we presume we have an unique ID for every picture

for ($id_pic = 1; $id_pic < 10000; $id_pic += 100)
{
#       echo PHP_EOL.getPadImgFolder($id_pic).'/'.$id_pic.'.jpg';
#       echo PHP_EOL.getOrdImgFolder($id_pic).'/'.$id_pic.'.jpg';
#       echo PHP_EOL.getSparseImgFolder($id_pic).'/'.$id_pic.'.jpg';
#       echo PHP_EOL.getSubPadImgFolder($id_pic).'/'.$id_pic.'.jpg';
        echo PHP_EOL.getDateImgFolder($id_pic).'/'.$id_pic.'.jpg';

}

//one root
function getPadImgFolder($id,$digits_per_folder=3,$max_digits=10)
{
        return substr(str_pad($id,$max_digits,'0',STR_PAD_LEFT),0,$max_digits-$digits_per_folder);
}


//for very large databases
function getSubPadImgFolder($id,$digits_per_folder=3,$max_digits=30)
{
        $pad = str_pad($id,$max_digits,'0',STR_PAD_LEFT);

        return chunk_split($pad,$digits_per_folder,DIRECTORY_SEPARATOR);

}

function getOrdImgFolder($id,$digits_per_folder=3)
{
        return (string)ceil($id / (str_pad('1',$digits_per_folder+1,'0')));
}



function getDateImgFolder($timestamp)
{
        return
                date('Y'.DIRECTORY_SEPARATOR
                .'m'.DIRECTORY_SEPARATOR
                .'d',$timestamp)
        ;
}

function getSparseImgFolder($id)
{
        #$hash =  hash('sha1',$id,false);
        $hash = hash('crc32',$id,false);

        return
                substr($hash,0,3).DIRECTORY_SEPARATOR
}

return;