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  1. <?php
  2. $baseArr = array('name', 'email', 'phone', 'password');
  3. $myArray = array('name' => 'david', 'email' => 'aaa@aaa.aaa', 'phone'=> '123456789');
  4.  
  5. $myArray = array_merge(array_fill_keys($baseArr, ''), $myArray);
  6.  
  7. print_r($myArray);
Success #stdin #stdout 0.01s 52488KB
stdin
Standard input is empty
stdout
Array
(
    [name] => david
    [email] => aaa@aaa.aaa
    [phone] => 123456789
    [password] => 
)