What is php array key

array_keys() function returns a new array containing all the keys in the array.

Grammar

array_keys(array,value,strict)

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Example

Return a new array containing all the key names in the array:

<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
print_r(array_keys($a));
?>

Running result:

Array ( [0] => Volvo [1] => BMW [2] => Toyota )

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