3v4l.org

run code in 300+ PHP versions simultaneously
<?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 git.master, git.master_jit, rfc.property-hooks
01 Warning: Undefined variable $a in /in/FpPfM on line 4 1 Warning: Undefined variable $a in /in/FpPfM on line 5

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