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How to use the array_keys() function in PHP

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Definition

In this tutorial, I will show you how to collate only key values from an array using the array_keys function in PHP.

array_keys — Return all the keys or a subset of the keys of an array(*)

array_keys() returns the keys, numeric and string, from the array.

If a search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned.

Syntax:

array_keys(array, search_value, strict)

array - An array containing keys to return.

search_value - If specified, then only keys containing these values are returned.

strict - Determines if strict comparison (===) should be used during the search.

Code

Create an array containing employees as keys and salaries as values.

Using the array_keys() function get all employees' name and print each of them.

To obtain the name of the employee who gets the 22500 salary as integer, use the array_keys function with search_value and strict parameters.

<?php

$salary_information = array(
      "John" => 18000,
	  "Jane" => 19500,
	  "David" => 20000,
	  "Michael" => 22000,
	  "Emily" => 22500
);

$employees = array_keys($salary_information);

$search_salary = array_keys($salary_information, 22500, true);

foreach($employees as $employee){
	echo '<p> - '.$employee.'</p>';
}

echo '<p style="color:#002699;">Search = '.$search_salary[0].'</p>';

?>

Result:

Employees:

- John

- Jane

- David

- Michael

- Emily

Search = Emily

References

(*) https://www.php.net/manual/en/function.array-keys.php