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主にarrayの挙動を確認したい
<?php
$hoge = array(1, 2, 3);
var_dump(array_key_exists(array(), $hoge)); // PHP Warning: array_key_exists(): The first argument should be either a string or an integer bool(false)
var_dump(isset($hoge[array()])); // PHP Warning: Illegal offset type in isset or empty bool(false)
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