3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo is_bool(false); echo is_bool(null)? 1 : ' null '; echo is_bool(true); function test(){ return 0; } var_dump(test()); echo (int)(bool)""; // 0 echo 0; // "0"; var_dump((bool)(string)0); // ""?
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1 null 1int(0) 00bool(false)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/CkGik on line 9
Process exited with code 255.
preferences:
265.91 ms | 401 KiB | 460 Q