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@ 2020-01-21T19:43:47Z

<?php

$availablePieces = [];

$bitfield = hex2bin(preg_replace('(\s)', '', 'ffffffff 
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffffff
                     ffffe0'));
                     
for ($i = 0; $i < strlen($bitfield); $i++) {
    $char = ord($bitfield[$i]);
    for ($j = 0; $j < 8; $j++) {
        $availablePieces[] = ($char & (0b10000000 >> $j)) !== 0;
    }
}


var_dump($availablePieces);

var_dump: documentation ( source)
hex2bin: documentation ( source)
preg_replace: documentation ( source)
ord: documentation ( source)

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27.83 ms | 402 KiB | 5 Q