Introduction to how to use the PHP array_fill_keys() function

PHP's array_fill_keys() function is a very useful function that can set the same value for all keys in an array.

The syntax of the array_fill_keys() function is as follows:

array_fill_keys(array $keys, $value): array

Among them, the $keys parameter is a required parameter, which is an array of key names, and the $value parameter is a required parameter, which is The value to set for all keys.

For example, we can use the array_fill_keys() function to set the same value for all keys in an array:

$keys = ['a', 'b', 'c', 'd'];
$value = 0;

$result = array_fill_keys($keys, $value);

print_r($result);

The output is:

Array
(
    [a] => 0
    [b] => 0
    [c] => 0
    [d] => 0
)

Use the array_fill_keys() function Very convenient, it allows us to easily set the same value for all keys in an array without writing a loop statement.

In addition, the array_fill_keys() function has a very useful feature: if there is a non-string key name in the $keys parameter, it will be automatically converted to a string. For example:

$keys = ['a', 'b', 1, 2];
$value = 'hello';

$result = array_fill_keys($keys, $value);

print_r($result);

The output result is:

Array
(
    [a] => hello
    [b] => hello
    [1] => hello
    [2] => hello
)

As you can see, the function will automatically convert the numbers 1 and 2 into the strings '1' and '2'.

Summary:

array_fill_keys() function is a very useful function in PHP. It can set the same value for all keys in an array, and if there is a non- The key name of a string, which will be automatically converted to a string. Using it allows us to operate arrays more conveniently, reduce the amount of code and improve code efficiency.

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