Array functions in PHP8: various operating methods of array_replace()

Array functions in PHP8: Multiple operation methods of array_replace()

When developing web applications, arrays are one of the inevitable data types. PHP provides many array functions, among which the array_replace() function is a very powerful and useful function. It can be used to merge multiple arrays, replace values ​​in arrays, delete key-value pairs, insert new key-value pairs, etc.

This article will introduce various operation methods of the array_replace() function to help you better understand and use this function.

1. Merge multiple arrays

If you need to merge multiple arrays into one array, you can use the array_replace() function. It accepts multiple arrays as parameters and returns a merged new array. If there are the same key names, the subsequent array will overwrite the value of the previous array.

Sample code:

$array1 = array('a', 'b', 'c');
$array2 = array('d', 'e', 'f');
$array3 = array('g', 'h', 'i');

$new_array = array_replace($array1, $array2, $array3);
print_r($new_array);

Output result:

Array
(
    [0] => g
    [1] => h
    [2] => i
)

In the above example, array $array3 covers the same key name in $array1 and $array2, so new The value of the array is $arry3.

2. Replace the value in the array

If you want to replace the value of a specific key name in the array, you can also use the array_replace() function. The following code is an example:

$array = array('a' => 1, 'b' => 2, 'c' => 3);
$array_replaced = array_replace($array, array('b' => 4));

print_r($array_replaced);

Output result:

Array
(
    [a] => 1
    [b] => 4
    [c] => 3
)

In the above example, we replaced the value of the 'b' key name in the array with 4 and returned the replaced array.

3. Delete key-value pairs

If you want to delete a key-value pair in the array, you can also use the array_replace() function. The sample code is as follows:

$array = array('a' => 1, 'b' => 2, 'c' => 3);
$array_replaced = array_replace($array, array('b' => null));

print_r($array_replaced);

Output result:

Array
(
    [a] => 1
    [b] =>
    [c] => 3
)

In the above example, we use a null value to replace the value with the key name 'b' in the array, thus deleting this key value right.

4. Insert a new key-value pair

If you want to insert a new key-value pair into the array, you can also use the array_replace() function and add a new one in the new array Key-value pairs. The sample code is as follows:

$array = array('a' => 1, 'b' => 2, 'c' => 3);
$array_replaced = array_replace($array, array('d' => 4));

print_r($array_replaced);

Output result:

Array
(
    [a] => 1
    [b] => 2
    [c] => 3
    [d] => 4
)

In the above example, we add a new key-value pair 'd'=>4 to the array and return the inserted new Array after key-value pairs.

Summary

array_replace() function is a very powerful and useful function that can be used to merge multiple arrays, replace values ​​in arrays, delete key-value pairs, and insert new key values. equal. I hope the introduction in this article can help you better understand and use this function.

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