Online PHP editor | output for Nmk0t

@ 2018-06-14T22:14:42Z

<?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 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: NULL bool(false) ---------- string(4) "test" bool(true) ---------- Warning: Undefined variable $test3 in /in/Nmk0t on line 17 NULL bool(false)
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: NULL bool(false) ---------- string(4) "test" bool(true) ---------- Notice: Undefined variable: test3 in /in/Nmk0t on line 17 NULL bool(false)
Output for 7.3.32 - 7.3.33: NULL bool(false) ---------- string(4) "test" bool(true) ---------- NULL bool(false)

preferences:dark modelive previewkey bindings