php function delete elements from array

In PHP, there are many ways to delete elements in an array. Several of the most commonly used methods are described below.

1. unset function

The unset function is a method provided by PHP to delete variables. One or more elements in an array can be deleted through the unset function. The following is a sample code that uses the unset function to delete array elements:

$arr = array('apple', 'banana', 'orange', 'pear');
unset($arr[2]); //删除数组中的第3个元素
print_r($arr);

After the above code is executed, the output result is:

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

As you can see, the unset function removes the third element in the array orange' deleted.

2. array_splice function

array_splice function can remove a portion of elements from an array and replace them with another set of elements. This function can count and delete elements starting from the end of the array by using a negative number as the starting position. The following is a sample code that uses the array_splice function to delete array elements:

$arr = array('apple', 'banana', 'orange', 'pear');
array_splice($arr, 1, 1); //删除数组中的第2个元素
print_r($arr);

After the above code is executed, the output result is:

Array (
    [0] => apple
    [1] => orange
    [2] => pear
)

As you can see, the array_splice function deletes the second element in the array' banana' deleted.

3. array_filter function

The array_filter function can filter elements in an array. When the callback function returns false, the elements will be filtered out. The following is a sample code that uses the array_filter function to delete array elements:

$arr = array('apple', 'banana', 'orange', 'pear');
$arr = array_filter($arr, function($val) {
    return $val !== 'orange';
});
print_r($arr);

After the above code is executed, the output result is:

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

As you can see, the array_filter function changes the value in the array to 'orange' The element was deleted.

To sum up, there are many ways to delete array elements in PHP, and you can choose the appropriate method according to actual needs. No matter which method is used, be aware that the index value of the array may change after the element is deleted.

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