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Editing: BitUtils.php
<?php declare(strict_types = 1); namespace BaconQrCode\Common; /** * General bit utilities. * * All utility methods are based on 32-bit integers and also work on 64-bit * systems. */ final class BitUtils { private function __construct() { } /** * Performs an unsigned right shift. * * This is the same as the unsigned right shift operator ">>>" in other * languages. */ public static function unsignedRightShift(int $a, int $b) : int { return ( $a >= 0 ? $a >> $b : (($a & 0x7fffffff) >> $b) | (0x40000000 >> ($b - 1)) ); } /** * Gets the number of trailing zeros. */ public static function numberOfTrailingZeros(int $i) : int { $lastPos = strrpos(str_pad(decbin($i), 32, '0', STR_PAD_LEFT), '1'); return $lastPos === false ? 32 : 31 - $lastPos; } }
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