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<?php //test 1 is defined, but has a value of null. isset will return false, use causes no error. $test1 = null; var_dump($test1); var_dump(isset($test1)); echo "\n----------\n\n"; //test2 is defined with a string value. isset will return true $test2 = "test"; var_dump($test2); var_dump(isset($test2)); echo "\n----------\n\n"; //test3 is not defined, isset returns false and use causes error. var_dump($test3); var_dump(isset($test3));
Output for git.master, git.master_jit, rfc.property-hooks
NULL bool(false) ---------- string(4) "test" bool(true) ---------- Warning: Undefined variable $test3 in /in/Nmk0t on line 17 NULL bool(false)

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