<?php class A { protected $i = 0; public function __toString() { $this->i++; return "$this->i"; } } $a = new A; $b = [100, $a]; $c = [100, (string) $a]; $d = [100, $a]; var_dump( array_intersect($b, $b), array_intersect($c, $c), array_intersect($d, $d) );
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