How to check if a value is greater than within an array

Question

I have the following SQL statement:

$query  = "SELECT item, COUNT(*) as number FROM shop GROUP BY item";

This will give me the following result:

item    number
item1       23
item2       15
item3        4

I want to use this to make menu items, so normally the menu would look:

item1
item2
item3

But I want to do a check if an item has less than 10 records, that I don't want to display this item.

So in this example, the menu would be like:

item1
item2

Any idea how to achieve this?

I would like to do this in PHP because I need all the items in the query but will only want to show them which are greater then 10 and need the other items later on.

Answer 1

If you want to do this in PHP then you can do like this

function filterArray($value){
    return ($value.number > 10);
}

$filteredArray = array_filter($yourDBArray, 'filterArray');

foreach($filteredArray as $k => $v){
    //your desired array
}

In terms of speed Mysql option is good as suggested above.

Answer 2

Just change your query from

SELECT item, COUNT(*) as number FROM shop GROUP BY item

to

SELECT item, COUNT(*) as number FROM shop GROUP BY item HAVING number>=10

Answer 3

There is two options to filter the data so only the rows with more then 10 will appear.

1. At the SQL query

__

SELECT item, COUNT(*) as number FROM shop GROUP BY item HAVING number > 9

This will cause you to recieve only the requested rows from the database

2. Filter with PHP - every time you want to print the menu or testing it out, just can the value of ' number ' in the array reutrned from the query. You can also allocate new array and insert all the values that contains ' number ' that bigger then 10.

Answer 4

I noticed php is tagged. For the sake of options, here's how I'd go about separating the unneeded data in php if you were to get it from the database as-is:

foreach ($data as $item) {
    $num = (int) $item['number']; // force of habit
    if ($num >= 10) {
        // display it
    }
}

I'd probably separate the data at the database step, but this works if it's the route you want to take.

Answer 5

As you really need to perform this in PHP you could use array_filter() which, using a closure , will remove items which number is less than 10:

$more_than_ten = array_filter($items, function ($i) { return $i['number'] >= 10; });

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Doing it with SQL would be a better solution (about performances). In case you'd need it, you could use the HAVING clause (you can't perform a WHERE number >= 10 ):

SELECT
    item,
    COUNT(*) as number
FROM shop
GROUP BY item
HAVING number >= 10