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 )
  )

Example 4: Initializing a Configuration Array

$config_keys = ['timezone', 'language', 'currency'];
$default_values = array_fill_keys($config_keys, 'default_value');
print_r($default_values);
// Output: Array ( [timezone] => default_value [language] => default_value [currency] => default_value )

Example 5: Placeholder Array with Empty Values

$keys = ['name', 'email', 'phone'];
$placeholders = array_fill_keys($keys, '');
print_r($placeholders);
// Output: Array ( [name] => [email] => [phone] => )

Example 6: Generating a Grid with Default Values

$grid_keys = range(1, 100);
$grid = array_fill_keys($grid_keys, 0);
print_r($grid);
// Output: Array ( [1] => 0 [2] => 0 ... [100] => 0 )

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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