Online PHP editor | refs for UlGas

<?php $dec = intval((-1 * PHP_INT_MAX) + 1); var_dump(decbin($dec), dec2bin($dec)); function dec2bin($dec) { if ($dec == 0) { return 0; } $sgn = 1; if ($dec < 0) { $sgn = -1; $dec = (PHP_INT_MAX + $dec) + 1; } $bin = ''; while ($dec > 0) { $bin = ($dec & 1) . $bin; $dec >>= 1; } return $sgn > 0 ? $bin : '1' . str_pad($bin, 63, '0', STR_PAD_LEFT); }