Passing multidimensional Array's

7blake · November 7, 2014

I recently posted a simple query about ISSET and finally got that simple problem solved thanks to you guys. But I've hit a new snag. I've create a simple sort of cart, or record counter. While I can add/remove/clear items and display their affilated arrays, I don't know how to cycle through a multidimensional array that is dynamically set.

Something like $_SESSION['Primary'][$items][$attributes] - Where $items is a dynamic set, and $attributes is a fixed set of keys with values.

I can target individual $Items, or display all the items in there. But I can't display all the Items and their subsequent $attributes aswell. Do I have to write 1 set of Ajax code for just displaying the $items, and another for each individual set of $attributes? Or is their a way to cycle through each $item, and then all of it's(or specific) $attributes and values? I've tried using loops which logically work, but I can't pass it through json_encode.

Is there any documentation I could read in relation to this? I feel this is the key component to manuvering through a database of sorts. I'm just not entirely sure how to go about accessing multidimensional Array's without a ton of code that becomes redudent. And even then, it wouldnt work well with a dynamic setup.

Edited November 7, 2014 by 7blake

Barand · November 7, 2014

Do I take it that you have something like

$_SESSION['Primary'] = array (
            'item1' => array (
                            'color' => 'red',
                            'size'  => 'large',
                            'price' => 25.00,
                            'qty'   => 2
                        ),
            'item2' => array (
                            'color' => 'orange',
                            'size'  => 'small',
                            'price' => 15.00,
                            'qty'   => 1
                        ),
            'item3' => array (
                            'color' => 'blue',
                            'size'  => 'medium',
                            'price' => 65.00,
                            'qty'   => 1
                        )

        );

If so then to loop through the attributes of "item2" it would be

foreach ($_SESSION['Primary']['item2'] as $attr => $value) {
    echo "$attr : $value<br>";
}

giving

color : orange
size : small
price : 15
qty : 1

7blake · November 8, 2014

Ah you got me thinking

I've been trying to do this with json_encode.. when infact I can just do it with basic ajax/php data transfer. (Sorry, I don't know the correct way of saying this).

Here's my code.

<!DOCTYPE HTML >
<html>
<head>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script type='text/javascript'>


    $(document).ready(function() {
    		    
    		    $("#updateCart").click(function() {    // Update view on cart
    		    		    
    		    		    $("#cartStatus").fadeOut(function() {
    		    		    		    $(this).empty();
    		    		    
    		     $.get(
			'info.php',
			{"cartDisplay2" : "test"},
                function(data) {
			$('#cartStatus').append(data);
		
    		    });
    		    		    }).fadeIn();
    		    });
    		        		    
    		   var name; 
    		   
    		    	
    		    	$(".item").click(function() {     // select Item 
    		    		name = $(this).attr("id");
    		    		$(".item").css({"border" : "1px solid black", "color" : "black"});
    		    		if (this.id== name){ 
    		    		
    		    		$(this).animate({width:"0px", height:"0px", top:"+=25px", left:"+=25px"}, 200, function() {
    		    				$(this).css({"border" : "1px solid blue", "color" : "blue"});
    		    		}).animate({width:"50px", height:"50px", top:"-=25px", left:"-=25px"}, 200);
    		    		}
    		    	});
    		      		    	
        $("#button").click(function() { // Add to Cart
        		
        		$("#click").fadeOut(300, function() {
        		$(this).empty();
        	
            $.get(
                "info.php",
                {"name":name},
                function(data) {
                    $.each(data, function(k,v){
                    		    
                        $("#click").append(k + " : " + v + "<br />").fadeIn();
                    })
                    $("#click").append("--------------------\n");
                },
                "json"
            )
        						});
            
        });
        
        $("#minus").click(function() { // Minus From cart
        		
        		$("#click").fadeOut(300, function() {
        		$(this).empty();
        		
            $.get(
                "info.php",
                {"name1":name},
                function(data) {
                    $.each(data, function(k,v){
                    		    
                        $("#click").append(k + " : " + v + "<br />").fadeIn();
                    })
                    $("#click").append("--------------------\n");
                },
                "json"
            )
        						});
            
        });
        
           $("#clear").click(function() { // Clear from Cart
        		
        		$("#click").fadeOut(300, function() {
        		$(this).empty();
        		
            $.get(
                "info.php",
                {"clear":name},
                function(data) {
                    $.each(data, function(k,v){
                    		    
                        $("#click").append(k + " : " + v + "<br />").fadeIn();
                    })
                    $("#click").append("--------------------\n");
                },
                "json"
            )
        						});
            
        });
    })
</script>

<style>
#container {
	position:absolute;
	width:10%;
	height:15%;
	top:5%;
	border:1px solid black;
	overflow:auto;
}

#cartStatus {
	position:absolute;
	width:12%;
	height:20%;
	top:5%;
	left:11%;
	border:1px solid black;
}

.item {
	width:50px;
	height:50px;
	position:absolute;
	border:1px solid black;
	font-size:.75em;
	text-align:center;
	top:266px;
}
#item1 {
	left:10px;
}

#item2 {
	left:64px
}

#item3 {
	left:118px
}


</style>

</head>
<body>
<input type="button" name="button" id="button" value="Add">  
<input type="button" name="minus" id="minus" value="Minus">
<input type="button" name="clear" id="clear" value="Clear">
<input type="button" name="clear" id="updateCart" value="updateCart">

<div id="container">
	<div id="click"></div>
</div>
<div id="cartStatus">
</div>


<div id="item1" class="item">Item 1</div>
<div id="item2" class="item">Item 2</div>
<div id="item3" class="item">Item 3</div>
</body>
</html>

<?php

session_start();

// Add to Cart

if (isset($_GET['name'])) {
    $itemId = $_GET['name'];
        
    if (isset($_SESSION['cart'][$itemId])) {
    	    $totalPrice = 2.5;
        $_SESSION['cart'][$itemId]['Quantity']++;
          $quantity = $_SESSION['cart'][$itemId]['Quantity'];
          $price = $_SESSION['cart'][$itemId]['Price'];
          $totalPrice = $quantity * $price;
          $_SESSION['cart'][$itemId]['TotalPrice'] = $totalPrice;
    }
    else {
    	$totalPrice = 2.5;
        $_SESSION['cart'][$itemId] = array('Id' => $itemId, 'Quantity'=>1, 'Price'=>2.50, 'TotalPrice' => $totalPrice);
    $quantity = $_SESSION['cart'][$itemId]['Quantity'];
    $price = $_SESSION['cart'][$itemId]['Price'];
    $totalPrice = $quantity * $price;
    $_SESSION['cart'][$itemId]['TotalPrice'] = $totalPrice;
    }
    

    echo json_encode($_SESSION['cart'][$itemId]);

}
else echo '';


// Minus from Cart

if (isset($_GET['name1'])) {
    $itemId1 = $_GET['name1'];
    
    if (isset($_SESSION['cart'][$itemId1])) {
        $_SESSION['cart'][$itemId1]['Quantity']--;
        $quantity = $_SESSION['cart'][$itemId1]['Quantity'];
          $price = $_SESSION['cart'][$itemId1]['Price'];
          $totalPrice = $quantity * $price;
          $_SESSION['cart'][$itemId1]['TotalPrice'] = $totalPrice;
    }
    else {
    	    $totalPrice = 2.5;
        $_SESSION['cart'][$itemId1] = array('Id' => $itemId1, 'Quantity'=>1, 'Price'=>2.50, 'Total Price' => $totalPrice);
	    $quantity = $_SESSION['cart'][$itemId1]['Quantity'];
	    $price = $_SESSION['cart'][$itemId1]['Price'];
	    $totalPrice = $quantity * $price;
    }
    

    echo json_encode($_SESSION['cart'][$itemId1]);

}
else echo '';
     

// Clear from Cart
if (isset($_GET['clear'])) {
    $itemClear = $_GET['clear'];
    
    if (isset($_SESSION['cart'][$itemClear])) {
        $_SESSION['cart'][$itemClear]['Quantity'] = 0;
        $quantity = $_SESSION['cart'][$itemClear]['Quantity'];
          $price = $_SESSION['cart'][$itemClear]['Price'];
          $totalPrice = $quantity * $price;
          $_SESSION['cart'][$itemClear]['TotalPrice'] = $totalPrice;
    }
    else {
    	   echo '';
    }
    

    echo json_encode($_SESSION['cart'][$itemClear]);

}
else echo '';
                    
// Display Cart Contents


if(isset($_GET['cartDisplay'])) {

	
echo json_encode($_SESSION['cart']);
	
	
}

if(isset($_GET['cartDisplay2'])) {


	foreach ($_SESSION['cart'] as $item => $value){
		
		
		
		foreach($_SESSION['cart'][$item] as $test){
			
			echo $test . " : ";
		}
		
		
	}
	
	
}

?>

(it's just a practice one. There's lots of things not coded in. Nothing is unset, or disabling -1 counters, or the cart display when there are no contents. But it works fine for now I think. Unless you can see I'm going about something very wrong to the standards today)

So this sorta works fine. I can just design the PHP itself to be better displayed. So is one of json's methods for passing entire arrays through ajax?

Edited November 8, 2014 by 7blake

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