Description:
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There is a short function, which starts one query and then parse the results.
If the script goes to commented line, the $ret array new value makes a recursive array.
I checked set the value by hand, like ='35';, but the PHP do the same.
I think it's a bug, because I downgrade the v5.3.27 and the script functional normally again.

Test script:
---------------
$ret = Array();

$query = "SELECT * FROM any WHERE ID=".html2sql($ID).";";
	
$results = mysqli_query($connectedID, $query);
if (mysqli_num_rows($results)) {
    $i = 0;
    while ($row = mysqli_fetch_assoc($results)) {
	$r[$i]['GyujtoEgysegID'] = $row['GyujtoEgysegID'];
	$r[$i]['EgysegID'] = $row['EgysegID'];
	$r[$i]['Jogosultsag'] = $row['Jogosultsag'];
	$i++;
    };
    $j = 0;
    foreach ($r as $d) {
	if ($d['GyujtoEgysegID'] != '') {
		$gye = GET_user_egysegGyujto($d['GyujtoEgysegID']);
		foreach ($gye as $e) {
			$ret[$j]['EgysegID'] = $e['EgysegID'];
			$ret[$j]['Jogosultsag'] = $d['Jogosultsag'];
			$j++;
		};
	}else {
		$ret[$j]['EgysegID'] = $d['EgysegID']; // This is goes RECURSIVE
		$ret[$j]['Jogosultsag'] = $d['Jogosultsag'];
		$j++;
	};
	};
	return $ret;
}else {
	return false;
};

Expected result:
----------------
Something like this:
$ret = Array([0] => Array('EgysegID' => 2, 'Jogosultsag' => 1), Array...

Actual result:
--------------
$ret = Array([0] => Array('EgysegID' => 2, 'Jogosultsag' => 1), Array([1] => [1] => *RECURSIVE*