asked on

if statement malfunction

I have this session variable:

$_SESSION['protiens']['wed']

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it stores inside wed, the qty chosen along with the price.
when I print it out I get:

Array ( [3800] => Array ( [qty] => 1 [price] => 10 ) [2702] => Array ( [qty] => 1 [price] => 20 ) [4000] => Array ( [qty] => 0 [price] => 10 ) )

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I have an if statement which is :

if($_SESSION['protiens']['wed'][$id]['qty'] == 0){echo " none";}

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"none" hides my div. but as you can see there are 2 ids where wed has qty = 1, but the if statement just goes on the last id, where the qty = 0, and hides my div. Is there a way where I make my if statement check if all the qty = 0, to hide, and if there is at least one qty that equals more than 0 to skip the if statement?

Julian Hansen

Please show full source.

Here is your above code in a working script - nothing wrong with the script so I am guessing it is somewhere in the code you have not shown us.

<?php
session_start();

$_SESSION['proteins'] = array();
$_SESSION['proteins']['wed'] = array ( 
	3800 => Array ( 
		'qty' => 1, 
		'price' => 10 
	), 
	2702 => Array  ( 
		'qty' => 1, 
		'price' => 20 
	),
	4000 => Array ( 
		'qty' => 0,
		'price' => 10 
	) 
);
$ids = array_keys($_SESSION['proteins']['wed']);
foreach($ids as $id) {
	if($_SESSION['proteins']['wed'][$id]['qty'] == 0){echo " none<br/>";}
	else {
		echo "Not None<br/>";
	}
}

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Jazzy 1012

ASKER

The problem is that the $id, in this case is the last id which is "4000" which has the qty as zero. That is why the if statement gets executed. I want it to check every id and if there is at least 1 id that has a qty of greater than 0, to not execute the if statement. But if I do a foreach loop then it will execute more than once. I just need a way to allow the if statement to check all the ids to see if the qty is = to 0 or not

Ray Paseur

@Julian: See also:
https://www.experts-exchange.com/questions/29017689/Make-an-array-show-the-subkey-and-put-it-in-a-query.html

Basically you need an iterator to walk through the nested arrays, find the quantities, and make if() decisions about what is found by the iteration process.

hielo

Try:

session_start();
...

# $qty will contain the ids/keys to all the array that contain qty>0
# so if it ends up being empty, then all subarrays have qty==0
$qty=Array();

# saving reference to $qty variable since the third argument to array_walk is not pass by reference. So, $result is just a "stub"
$result[]=&$qty;

# apply array_walk.  Using an anonymous function as the callback (http://php.net/manual/en/functions.anonymous.php)
array_walk($_SESSION['protiens']['wed'], function(&$arr,$key,&$dup){if( $arr['qty']>0 ){$dup[0][]=$key;}}, $result);

# delete  the "stub"
unset($result)

# instead of this
#    if($_SESSION['protiens']['wed'][$id]['qty'] == 0){echo " none";}
# you need:
if( empty($qty) )
{
 echo 'none';
}

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Julian Hansen

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