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<?php $foo = array(); $foo[PHP_INT_MAX] = 'hello'; $foo[99999999999999999999999999999999999999] = 'world'; var_dump($foo);
based on 5hgHi
Output for 5.3.0 - 7.1.0
array(2) { [9223372036854775807]=> string(5) "hello" [0]=> string(5) "world" }
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.2.17
array(2) { [9223372036854775807]=> string(5) "hello" [-9223372036854775808]=> string(5) "world" }
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/e1ocW on line 5 array(2) { ["PHP_INT_MAX"]=> string(5) "hello" [-9223372036854775808]=> string(5) "world" }