How to delete elements in php array

php Array method to delete elements: 1. Use the unset function to delete array elements; 2. Use the array_splice function to delete an element without keeping the index; 3. Use the array_diff function to delete multiple elements by value; 4. Use array_diff_key function to delete elements.

#The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

Four ways to delete elements from an array in PHP

• Delete an element while keeping the original index unchanged

Use the unset function, the example is as follows:

<?php
    $array = array(0 => "a", 1 => "b", 2 => "c");
    unset($array[1]);
               //↑ 你想删除的key
?>

Output:

Array (
    [0] => a
    [2] => c
)

Using unset does not change the original index of the array. If you plan to rearrange the index (so that the index starts from 0 and is continuous), you can use the array_values ​​function:

$array = array_values($array);
/*
输出
array(2) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "c"
}
*/

• Delete an element without keeping the index

Use the array_splice function, the example is as follows:

<?php
    $array = array(0 => "a", 1 => "b", 2 => "c");
    array_splice($array, 1, 1);
                       //↑ 你想删除的元素的Offset
?>

Output:

Array (
    [0] => a
    [1] => c
)

• Delete multiple elements by value, keeping the index

Use the array_diff function, the example is as follows:

<?php
    $array = array(0 => "a", 1 => "b", 2 => "c");
    $array = array_diff($array, ["a", "c"]);
                              //└────────┘→ 你想删除的数组元素值values
?>

Output:

Array (
    [1] => b
)

Similar to unset, array_diff will also keep the index.

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• Delete multiple elements by pressing the key and keep the index

Use the array_diff_key function, the example is as follows:

<?php
    $array = array(0 => "a", 1 => "b", 2 => "c");
    $array = array_diff_key($array, [0 => "xy", "2" => "xy"]);
                                   //↑           ↑ 你想删除的数组键keys
?>

Output:

Array (
    [1] => b
)

Similar to unset, array_diff_key will also maintain the index.

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