How to delete the key of an array in php

In PHP, there are several methods to delete the key of an array:

1. Use the unset function:

unset($array[key]);

Example:

$array = array("a" => 1, "b" => 2, "c" => 3);
unset($array["a"]);
print_r($array);

Output result:

Array ( [b] => 2 [c] => 3 )

2. Use the array_filter function:

The array_filter function can filter the elements in the array. If the callback function returns false, filter Remove the element. If true is returned, the element is retained.

Example:

$array = array("a" => 1, "b" => 2, "c" => 3);
$array = array_filter($array, function($key){
   return $key != "a";
}, ARRAY_FILTER_USE_KEY);
print_r($array);

Output result:

Array ( [b] => 2 [c] => 3 )

3. Use the array_diff_key function:

The array_diff_key function returns one of the arrays and all the keys of the other arrays difference set.

Example:

$array = array("a" => 1, "b" => 2, "c" => 3);
$array = array_diff_key($array, array("a" => ""));
print_r($array);

Output result:

Array ( [b] => 2 [c] => 3 )

The above are three common methods of deleting array keys, which can be flexibly selected and used in combination according to the actual situation.

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