How to remove value from array in php

During the development process, it is often necessary to delete a value from a PHP array. This process is not difficult, but it does require proper use of PHP's array functions. This article will show you how to remove values ​​from an array in PHP and explore three common methods.

1. Use the unset() function

In PHP, you can delete a value in the array through the unset() function. This function accepts one parameter, which is the key value of the element to be removed from the array.

Here is an example:

$fruits = array('apple', 'banana', 'orange', 'kiwi');
unset($fruits[2]);
print_r($fruits);

This code will delete the third element (index 2) in the $fruits array, which is 'orange'. The result will output the following:

Array
(
    [0] => apple
    [1] => banana
    [3] => kiwi
)

2. Using the array_diff() function

The array_diff() function is used to return the difference of two or more arrays. You can use this function to remove one or more elements from an array.

Here is an example:

$fruits = array('apple', 'banana', 'orange', 'kiwi');
$fruits = array_diff($fruits, array('orange'));
print_r($fruits);

This code will remove the 'orange' element from the $fruits array. The result will output the following content:

Array
(
    [0] => apple
    [1] => banana
    [3] => kiwi
)

It should be noted that the array_diff() function will return a new array, and the original array has not been modified. Therefore, the returned array needs to be assigned to the original array to achieve the deletion effect.

3. Using the array_splice() function

The array_splice() function can remove elements from an array and reassemble the array after deletion. This function accepts three parameters: the original array, the starting position of the element to be deleted, and the number of elements to be deleted.

Here is an example:

$fruits = array('apple', 'banana', 'orange', 'kiwi');
array_splice($fruits, 2, 1);
print_r($fruits);

This code will remove the 'orange' element from the $fruits array. The result will output the following content:

Array
(
    [0] => apple
    [1] => banana
    [2] => kiwi
)

It should be noted that the array_splice() function will modify the original array and re-index in the order in which the elements are deleted.

Conclusion

The above three methods can delete elements from PHP arrays. When using the unset() function, make sure that the key of the element you want to remove is set. When using the array_diff() function, assign the returned array to the original array. When using the array_splice() function, note that the index order of the original array may be changed.

When using these methods, you need to choose the most appropriate method according to the actual situation. If you only need to delete one element and do not need to combine the array, you can use the unset() function; if you need to delete multiple elements, you can use the array_diff() function; if you need to delete elements and convert the array at the same time, you can use the array_splice() function.

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