check if array exists in php mongodb?

Question

how to check if the array exists in php.

I ve the array called $contact["categories"] in some of the rows in mongodb collection. some rows doesn't have that array. how to check if particular array exists in collection??

Do you want to check only if array exists, or if it exists and holds certain elements? — Sergio Tulentsev
– Sergio Tulentsev, Commented Aug 10, 2012 at 11:35
just check only if the array exists?? does $exist work on arrays as well?? when i try to use $contact["categories"], since it doesnt exits it is throwing error as undefined index. — user1578749
– user1578749, Commented Aug 10, 2012 at 11:37
An "undefined index" warning is telling you that just that one array element does not exist, not necessarily the entire array. — MrWhite
– MrWhite, Commented Aug 10, 2012 at 11:40

Parvin Gasimzade · Accepted Answer · 2012-08-10 11:49:55Z

2

Use $exists parameter to check whether element exists or not.

array('array_name' => array('$exists' => true))

answered Aug 10, 2012 at 11:49

Parvin Gasimzade

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Muhammad Zeeshan · Accepted Answer · 2012-08-10 12:04:35Z

1

you can check the index existence like this:

 if (isset($contact["categories"])) {

    }

OR

array_key_exists()

if( array_key_exists('categories', $contact) ) {
}

edited Aug 10, 2012 at 12:04

answered Aug 10, 2012 at 11:39

Muhammad Zeeshan

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