Getting key from returned array

Question

I'm working in WooCommerce, but my question is related to basic PHP foreach statements.

I have a function that returns a multidimensional array. The topmost dimension, the key string is what I need. If you've familiar, $order->get_items();.

The order_item_id is stored as the key like this:

'488' => Array( /* Array stuffs */ )

That 488 is what I need. It wouldn't be a problem if the function I'm working with's foreach statement was:

foreach ($items as $k => $v)

Where I could just use $k, but it's set up as:

foreach ($items as $item)

Is there a way to set the value of the key in the array and pass it along as a parameter?

UPDATE:

Here is the function as it works.

foreach($order_items as $item) {
    $product = $order->get_product_from_item($item);
    $gc_enabled = get_post_meta($product->id, 'ignite_gift_enabled', true);
    if ( ! $gc_enabled)
        continue;
    $coupon_prefix = get_post_meta($product->id, '_coupon_prefix', true);
    if ( ! $coupon_prefix)
        $coupon_prefix = '';
    for ($x = 1; $x <= $item['qty']; $x++) { 
        $new_coupon = $this->adjust_voucher( $coupon_prefix, $mode, $msg_details, $order_id, $order_item_id, $product->id );
    }
}

$order_items is an array of items, the keys of which I need to pass along to other functions referenced, specificaly adjust_voucher.

I couldn't understand why can't foreach ( $items as $item ) be changed to foreach ( $items as $k => $item )? — rakeshjain
– rakeshjain, Commented Mar 21, 2014 at 19:43

Mike Brant · Accepted Answer · 2014-03-21 19:43:58Z

2

Just change the foreach syntax to be foreach($items as $key => $item). This would give you access to $key while not impacting any existing code in the loop which relies on $item.

answered Mar 21, 2014 at 19:43

Mike Brant

71.4k10 gold badges102 silver badges104 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Plummer Over a year ago

I tried that, but there are values that are retrieved with $item['foo']. I tried setting it to $v['foo'], but it broke.

Mike Brant Over a year ago

@tPlummer Why would you change to $v['foo'] if in your foreach you still have $key => $item? There should be no need at all to change any variable names inside the loop. Perhaps you should add more code context in your question and show specifically where you have such a problem.

Plummer Over a year ago

Because The foreach is `foreach($order_items as $item): ... for( $x=1; $x <= $item['qty']; $x++ )

Mike Brant Over a year ago

@tPlummer Yes. I am suggesting you change that line to foreach($order_items as $key => $item) that would give you access to the key for each item inside the loop.

Plummer Over a year ago

Got it. Issue wasn't with my code by some where else when they referenced the param. Thanks bud.

phpisuber01 · Accepted Answer · 2014-03-21 19:46:55Z

0

Here's a quick and dirty approach. Would be expensive if you have a large array -- but otherwise it would work.

$items = $order->get_items();
array_walk($items, function(&$v, $i) { $v['id'] = $i; });

This code adds another key to the array called id and assigns it the current key value.

Requires PHP 5.4 +

Example

$arr = array(
    486 => array(
        'name' => 'Bob',
    ),
    500 => array(
        'name' => 'Sam',
    ),
);

array_walk($arr, function(&$v, $i) { $v['id'] = $i; });

print_r($arr);

Example Result

Array ( 
    [486] => Array ( 
        [name] => Bob 
        [id] => 486 
    ) 
    [500] => Array ( 
        [name] => Sam 
        [id] => 500 
    ) 
)

answered Mar 21, 2014 at 19:46

phpisuber01

7,7453 gold badges25 silver badges26 bronze badges

2 Comments

Plummer Over a year ago

What is that $i? I seen it in other functions, but figured it was just a common parameter character.

phpisuber01 Over a year ago

In this example $i is the key of the current item being passed. function(&$value, $key) {} if you rename them.

craigjbass · Accepted Answer · 2014-03-21 20:06:37Z

0

You can set the values in your array (if needed up the call stack)

I tried that, but there are values that are retrieved with $item['foo']. I tried setting it to $v['foo'], but it broke.

foreach( $items as $key => &$item ) {
    $item['id'] = $key;

    /* $item now looks like
     * [ 'id' => ...,
     *   ... ]
     */

} unset( $item ); //Needed otherwise references can become complicated

answered Mar 21, 2014 at 20:06

craigjbass

153 bronze badges

1 Comment

RyanS Over a year ago

Can you expand on 'unset( $item ); //Needed otherwise references can become complicated' I dont think it makes much sense

Collectives™ on Stack Overflow

Getting key from returned array

3 Answers 3

5 Comments

2 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

5 Comments

2 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related