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debuginfo

This changes the values that are shown when an object is output using var_dump(). 

<?php
class C {
    private $prop;

    public function __construct($val) {
        $this->prop = $val;
    }

    public function __debugInfo() {
        return [
            'propSquared' => $this->prop ** 2,
        ];
    }
}
var_dump(new C(42));
?>