How Can I Efficiently Delete Elements from Arrays in PHP?

Deleting Elements from Arrays in PHP

When working with arrays in PHP, it's often necessary to remove specific elements. While setting an element to NULL doesn't delete it, there are several effective methods for element removal.

Deleting Single Array Elements

Using unset()

unset() directly removes an element by its key, leaving the array keys intact. However, it may be better to use array_values() afterward to convert all keys to numerically enumerated keys.

Using array_splice()

array_splice() removes an element by its offset, not its key. It automatically reindexes integer keys but leaves associative (string) keys unchanged.

Deleting Multiple Array Elements

Using array_diff()

array_diff() compares an array with a list of values and returns an array containing only the elements not found in the values list. It maintains the original array keys.

Using array_diff_key()

array_diff_key() compares an array with a list of keys and returns an array containing only the elements with keys not found in the keys list. The keys remain as they are.

Deleting Elements with a Specific Value

Using array_filter()

array_filter() removes elements from an array based on a callback function that returns TRUE for elements to be kept and FALSE for elements to be removed.

Using array_keys() with unset() or array_splice()

If you have multiple elements with the same value, you can use array_keys() to get all the keys for that value and then delete the elements using unset() or array_splice().

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