Online PHP editor | refs for K2oJp

<?php // 7f ef ff ff ff ff ff ff (Max double) // https://en.wikipedia.org/wiki/Double-precision_floating-point_format#Double-precision_examples // 7f = 127 // ef = 239 // ff = 255 $str = chr(127) . chr(239) . ' ' . str_repeat(chr(255) . chr(255) . ' ', 3); echo (string) unpack('d', "7fef ffff ffff ffff")[1], PHP_EOL;