How to delete specified elements from php array

In PHP, an array is a convenient data type that users can use to store multiple values. In some cases, we may need to delete an element from the array. PHP provides some quick and easy ways to achieve this goal.

This article will introduce some methods to delete specified elements of an array in PHP.

1. Use the unset function to delete elements
In PHP, the unset() function can be used to delete specified elements in an array. Here is an example:

$fruits = array("apple", "banana", "orange", "cherry");
// 删除数组中的第三个元素，即“orange”
unset($fruits[2]);
print_r($fruits);

The output is as follows:

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

In the above code, the unset() function deletes the third element in the fruits array, which is "orange". As you can see in the output, the element has been removed.

2. Use the array_splice function to delete elements
Another way to delete array elements is to use the array_splice() function. This function can simultaneously remove one or more elements from an array and replace them with new elements if necessary.

Look at an example below:

$fruits = array("apple", "banana", "orange", "cherry");
// 删除数组中的第三个元素，并用“lemon”替换它
array_splice($fruits, 2, 1, array("lemon"));
print_r($fruits);

The output is as follows:

Array
(
    [0] => apple
    [1] => banana
    [2] => lemon
    [3] => cherry
)

In the above code, the array_splice() function deletes the third element in the fruits array and uses "lemon" replaces the element. As you can see from the results, the element has been successfully replaced.

3. Use the array_filter function to delete elements
The array_filter() function in PHP can be used to delete some elements in the array. This function filters out unnecessary elements based on specified conditions.

Look at an example below:

$fruits = array("apple", "banana", "orange", "cherry");
//删除值为“orange”的元素
$fruits = array_filter($fruits, function($value) {
    return $value != 'orange';
});
print_r($fruits);

The output is as follows:

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

In the above code, the array_filter() function deletes "orange" in the fruits array based on the filter conditions. element. As you can see in the output, the element has been removed.

Summary:
In PHP, there are many ways to delete specified elements of an array. Whether you want to delete a single element or multiple elements, you can do it by using some built-in PHP functions. In the above method, whether using the unset() function, array_splice() function, or utilizing the array_filter() function, you can quickly and easily delete the specified elements in the array.

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