How to use array_splice() function in PHP and examples

Usage methods and examples of array_splice() function in PHP

In PHP programming, array is a commonly used data structure, which can be used to store multiple related data. The array_splice() function is a very powerful array operation function that can insert, delete and replace elements in the array. This article will introduce in detail how to use the array_splice() function and provide some code examples.

The syntax of the array_splice() function is as follows:
array_splice(array &$input, int $offset, int $length = 0, mixed $replacement = array()): array

The parameters of this function are explained as follows:

• $input: The array to be operated on needs to be passed in a reference.
• $offset: The starting position of modification. If it is a positive number, it will be calculated from the beginning of the array; if it is a negative number, it will be calculated from the end.
• $length: The number of elements to be deleted. If it is 0, the element is not deleted.
• $replacement: The replacement element to be inserted, which can be one or more. If left blank, only the element will be removed.

Below we use some examples to illustrate the use of the array_splice() function.

Example 1: Delete array elements
$fruits = array("apple", "banana", "cherry", "date", "elderberry");

// Delete the two elements starting from the second element
array_splice($fruits, 1, 2);

print_r($fruits);
?>
The output result is:
Array
(

[0] => apple
[3] => elderberry

)

In the above example, we call the array_splice() function to delete the two elements starting from the second element element. In the final output result array, "banana" and "cherry" are deleted.

Example 2: Replace array elements
$fruits = array("apple", "banana", "cherry", "date", "elderberry");

// Replace the first element with "apricot" and delete the next two elements
array_splice($fruits, 0, 3, "apricot");

print_r($fruits );
?>
The output result is:
Array
(

[0] => apricot
[1] => elderberry

)

In the above example, we call the array_splice() function to The first element in the array is replaced with "apricot" and the next two elements are deleted.

Example 3: Inserting array elements
$fruits = array("apple", "banana", "cherry");

// At no. Insert two elements after two elements
array_splice($fruits, 2, 0, array("date", "elderberry"));

print_r($fruits);
?>
The output result is:
Array
(

[0] => apple
[1] => banana
[2] => date
[3] => elderberry
[4] => cherry

)

In the above example, we call the array_splice() function to insert after the second element of the array Two new elements "date" and "elderberry" have been added.

It should be noted that the array_splice() function will re-index the keys of the array after modifying the array. If you need to retain the original key value, you can use the following method:
$fruits = array("apple", "banana", "cherry", "date", "elderberry");

// Insert two elements after the second element and retain the original key value
$spliceArray = array("date", "elderberry");
array_splice($fruits, 2 , 0, array_combine(array_keys($spliceArray), $spliceArray));

print_r($fruits);
?>
The output result is:
Array
(

[0] => apple
[1] => banana
[date] => date
[elderberry] => elderberry
[2] => cherry
[3] => date
[4] => elderberry

)

In the above example, we use the array_combine() function to combine the inserted elements with the original key values, thereby maintaining the original key values.

Through the above example, we can see that the array_splice() function is very useful in PHP array operations. It can realize the functions of deleting, replacing and inserting elements, and can flexibly modify the array. In actual development, mastering and flexibly using the array_splice() function can improve the efficiency and readability of the code.

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