How to clear array elements in php

php method to clear array elements: You can use the unset() function to clear array elements, such as [$array = array(0 => "a", 1 => "b", 2 => ; "c"); unset($array[1]);].

#If you want to delete an element in the array, you can use the unset() method.

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unset() method

Note that if you use the unset() method, it will not Change other keys.

Example:

<?php
$array = array(0 => "a", 1 => "b", 2 => "c");
unset($array[1]);
//↑ 你要删除的数组元素值的键
print_r($array);
?>

Output result:

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

If you want to delete multiple elements in the array, you cannot use the unset() function. , you need to use the array_diff() method, which requires knowing the key or value to be deleted.

array_diff() method

If you know the array element you want to delete, you can use array_diff().

<?php
$array = array(0 => "a", 1 => "b", 2 => "c");
$array = array_diff($array, ["a", "c"]);
//└────────┘→你要删除的元素
print_r($array );
?>

Output results:

Array(
    [1] => b
)

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