PHP array_splice() Function
Quick summary: The PHP array_splice() function removes or replaces elements in an array.
PHP array_splice() Syntax
array_splice(array &$array, int $offset, ?int $length = null, mixed $replacement = []): arrayPHP
PHP array_splice() Basic examples
$arr = [1,2,3,4];
array_splice($arr, 1, 2);
var_dump($arr);PHP
Output:
array(2) {
[0]=> int(1)
[1]=> int(4)
}Removes elements from the array.
PHP array_splice() Real-world usage
$queue = ['a','b','c'];
$next = array_splice($queue, 0, 1);
var_dump($next);
var_dump($queue);PHP
Output:
array(1) { [0]=> string(1) "a" }
array(2) { [0]=> string(1) "b" [1]=> string(1) "c" }Implements queue behavior.
PHP array_splice() Edge cases
$arr = [1,2];
array_splice($arr, 5, 1);
var_dump($arr);PHP
Output:
array(2) {
[0]=> int(1)
[1]=> int(2)
}Out-of-range offsets do not modify the array.
PHP array_splice() Common mistakes
Forgetting that array_splice modifies the array
array_splice works by reference.
Incorrect
array_splice([1,2,3],1);Correct
$arr=[1,2,3]; array_splice($arr,1);Pass a variable, not a literal.
PHP array_splice() Frequently Asked Questions
What does array_splice() do?
array_splice() removes a portion of an array and optionally replaces it.
Does array_splice() modify the original array?
Yes, it modifies the array in place.
What does array_splice() return?
It returns the removed portion.
Can array_splice() insert elements?
Yes, using the replacement parameter.
Supports negative offset?
Yes.
Preserves keys?
No, keys are reindexed.
Use case?
Removing or replacing parts of arrays.
Difference from array_slice()?
array_splice() modifies array, array_slice() does not.
Works with associative arrays?
Yes, but keys may reset.
Performance?
Depends on array size.
Can remove all elements?
Yes.
Alternative?
Manual array manipulation.