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<?php $a = array('ala', 'ma' => 'kota', 'a', 'sierotka' => array('ma', 'rysia')); $b = join('--', $a); var_dump($b); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Array to string conversion in /in/JQEds on line 4 string(19) "ala--kota--a--Array"