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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??

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1  
Read about $exists operator – Sergio Tulentsev Aug 10 '12 at 11:34
Do you want to check only if array exists, or if it exists and holds certain elements? – Sergio Tulentsev Aug 10 '12 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 Aug 10 '12 at 11:37
An "undefined index" warning is telling you that just that one array element does not exist, not necessarily the entire array. – w3d Aug 10 '12 at 11:40

2 Answers

up vote 1 down vote accepted

you can check the index existence like this: 

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

    }

OR

array_key_exists() 

if( array_key_exists('categories', $contact) ) {
}
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up vote 1 down vote

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

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