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I'm getting an error: Undefined offset: 1 in… I'm trying to display a 2D array after filling it. It displays fine if I echo it while it's being made, but after it is not working. I'm making a pyramid solitaire game and am trying to set up the pyramid of cards. There are 7 arrays, each with a set amount of cards in them. The first array only gets one cards while the last array gets seven. This makes it like a pyramid. All the indexes that don't get a card are set to 0. So it looks like this where the 1's are cards: 1 0 0 0 0 0 0 0 ​1 1 0 0 0 0 0 0 ​1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 The display2Darray function is what is causing the error. Specifically this line: if($array[$i][$j] == 0) Heres my main code: <?php include_once "pyramidCard.php"; include_once "pyramidDeck.php"; $theDeck = new Deck(); $pyramid = array(array(), array(), array(), array(), array(), array(), array()); $size = 7; $theDeck->shuffleCards(); makePyramid($pyramid, $size, $theDeck); display2Darray($pyramid, $size); //************************ // FRUNCTIONS * //************************ function makePyramid($array, $size, $deck) { $row = 0; for($i = 0; $i < $size; $i++) { for($j = 0; $j < $size; $j++) { if($j > $row) { $array[$i][$j] = 0; //echo ". <br>"; } else { $array[$i][$j] = $deck->dealCards(); //echo "this card is ".$array[$i][$j]->getFace()." of ".$array[$i][$j]->getSuit()."<br>"; } } $row++; } } function display2Darray($array, $size) { for($i = 0; $i < $size; $i++) { for($j = 0; $j < $size; $j++) { if($array[$i][$j] == 0) echo " "; else echo $array[$i][$j]->getFace()." of ".$array[$i][$j]->getSuit(); } echo "<br>"; } } ?>