(PHP 5 >= 5.2.0, PHP 7)
array_fill_keys — Fill an array with values, specifying keys
   Fills an array with the
   value of the value parameter, using the
   values of the keys array as keys.
  
keysArray of values that will be used as keys. Illegal values for key will be converted to string.
valueValue to use for filling
Returns the filled array
Example #1 array_fill_keys() example
<?php
$keys = array('foo', 5, 10, 'bar');
$a = array_fill_keys($keys, 'banana');
print_r($a);
?>
The above example will output:
Array
(
    [foo] => banana
    [5] => banana
    [10] => banana
    [bar] => banana
)