How Can I Efficiently Remove Elements and Re-index an Array in PHP?

Efficient Array Modification: Removing and Re-indexing

When working with arrays in programming, there may be scenarios where you encounter the need to remove specific elements and simultaneously re-index the array to maintain its integrity. This task can be easily accomplished using a combination of PHP's built-in functions.

To remove an element from an array based on its index, simply use the unset() function. For example, to remove the first element from the following array:

$foo = array(
    'whatever',  // [0]
    'foo',      // [1]
    'bar'       // [2]
);

You would use the following code:

unset($foo[0]);

However, this operation leaves a gap in the index sequence, as you can see:

$foo2 = array(
    'foo',  // [0], before [1]
    'bar'   // [1], before [2]
);

To re-index the array and fill in the gap, you can use the array_values() function. This function returns a new array with sequential numeric indexes:

$foo2 = array_values($foo);

The resulting array, $foo2, will have the same elements as $foo, but the indexes will be adjusted to start from 0.

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