Home Backend Development PHP Problem How to delete the key of an array in php

How to delete the key of an array in php

Apr 24, 2023 pm 03:50 PM

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

1. Use the unset function:

unset($array[key]);

Example:

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

unset($array["a"]);

print_r($array);

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Output result:

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Array ( [b] => 2 [c] => 3 )

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Copy after login
Copy after login

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:

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

$array array_filter($arrayfunction($key){

   return $key != "a";

}, ARRAY_FILTER_USE_KEY);

print_r($array);

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Output result:

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Array ( [b] => 2 [c] => 3 )

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Copy after login
Copy after login

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:

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

$array array_diff_key($arrayarray("a" => ""));

print_r($array);

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Output result:

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Array ( [b] => 2 [c] => 3 )

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Copy after login
Copy after login

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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