How to remove elements from array in php?

How to delete elements from an array in php? The following article will introduce to you several ways to delete elements from an array in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Several ways to delete elements from an array in PHP

1. Delete one element, and keep 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 array the original index. If you plan to rearrange the index (let the index start from 0 and be continuous), you can use the array_values ​​function:

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

2. 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
)

3, 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.

4, Delete multiple elements by 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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