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<?php echo (int) @isset( $a ); // false and w/o error msg echo (int) @empty( $a ); // true (false and 0 empty, too echo (int) @is_null( $a ); // true and error msg echo (int) @null === $a; // true and error msg
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
011 Warning: Undefined variable $a in /in/L7gIF on line 5
Output for 5.0.4 - 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 - 7.3.31, 7.4.0 - 7.4.33
011 Notice: Undefined variable: a in /in/L7gIF on line 5
Output for 7.3.32 - 7.3.33
011
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/L7gIF on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
011 Notice: Undefined variable: a in /in/L7gIF on line 5
preferences:
303.71 ms | 402 KiB | 459 Q