3v4l.org

run code in 300+ PHP versions simultaneously
<?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), 6); echo $str; echo (string) unpack('d', $str)[1], PHP_EOL;
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
�����NAN
preferences:
172.57 ms | 404 KiB | 225 Q