array_fill_keys(): Fill array with values and keys

$new_array = array_fill_keys ($keys_array, $value);

Example with two arrays

$keys=array('One' ,'Two','Three','Four');
$input='First';

$result=array_fill_keys($keys,$input);
while (list ($key, $val) = each ($result)) {
echo "$key -> $val <br>";
}

One -> First 
Two -> First 
Three -> First 
Four -> First 

Example 2

$keys=array('One' ,2,'3','F');
$input='First';

$result=array_fill_keys($keys,$input);
while (list ($key, $val) = each ($result)) {
echo "$key -> $val <br>";
}

One -> First 
2 -> First 
3 -> First 
F -> First

Example 3 : Using associative array

$keys=array('One' ,'Two','Three');
$input=array('First','Second');
$result=array_fill_keys($keys,$input);
print_r($result);

Array ( 
  [One] => Array ( [0] => First [1] => Second )
  [Two] => Array ( [0] => First [1] => Second )
  [Three] => Array ( [0] => First [1] => Second )
  )