Deleting item from lop

Resolved

(@chainkiller)

Lets say i have a loop for books

Array
(
    [0] => Array
        (
            [title] => book 1
            [author] => author 1
	)

    [1] => Array
        (
            [title] => book 2
            [author] => author 2
        )

    [2] => Array
        (
            [title] => book 3
            [author] => author 3

        )
    [3] => Array
        (
            [title] => book 4
            [author] => author 4

        )
)

Now if i delete books[2] the array becomes

Array
(
    [0] => Array
        (
            [title] => book 1
            [author] => author 1
		)

    [1] => Array
        (
            [title] => book 2
            [author] => author 2
        )

    [3] => Array
        (
            [title] => book 4
            [author] => author 4

        )
)

books[3] stays books[3], i assumed it would become books[2]

Is this how it’s supposed to be?

Someone reported this before.

https://wordpress.org/plugins/custom-field-suite/

Viewing 4 replies - 1 through 4 (of 4 total)

Plugin Author

Matt Gibbs

(@mgibbs189)

8 years, 6 months ago

That’s how PHP works. It will not modify any array keys for you.

Thread Starter

George

(@chainkiller)

8 years, 6 months ago

$arr1 = array(
            'title' => 'book 1',
            'author' => 'author 1'
	);
	$arr2 = array(
            'title' => 'book 2',
            'author' => 'author 2'
	);
	$arr3 = array(
            'title' => 'book 3',
            'author' => 'author 3'
	);
	$arr4 = array(
            'title' => 'book 4',
            'author' => 'author 4'
	);

	$array = array($arr1, $arr2, $arr3, $arr4);

In the code above if i remove $arr3 (not unset, delete completely from code), the index changes.

$arr1 = array(
            'title' => 'book 1',
            'author' => 'author 1'
	);
	$arr2 = array(
            'title' => 'book 2',
            'author' => 'author 2'
	);
	$arr4 = array(
            'title' => 'book 4',
            'author' => 'author 4'
	);

	$array = array($arr1, $arr2, $arr4);

So shouldn’t deleting a field have the same result?

Plugin Author

Matt Gibbs

(@mgibbs189)

8 years, 6 months ago

That’s because you’re creating an entirely new array.

See this: http://stackoverflow.com/questions/5943149/rebase-array-keys-after-unsetting-elements

Thread Starter