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PHP Warningyii\base\ErrorException

Invalid argument supplied for foreach()

$_GET = [
    'ProductFilter' => [
        'searchterm' => 'közel?t?s jelzö f?zisceruza',
    ],
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => 'https://pauer-land.hu/?oldal=14&q=k%C3%B6zel?t?s+jelz%C3%B6+f?zisceruza&hol=1&ufksz=126',
];