#php: return depending on the matrix elements
function toMatris(&$arr){
$array = $arr;
if (is_array($array) && count($array) > 0)
{
$tmp = array_shift(array_slice($array, 0, 1));
if (! is_array($tmp))
$array = array(
0 => $array
);
}
else{
$array = array();
}
return $array;
}
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