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<?php $employee = array ( 0=> array("employee_id"=>1, "firstName"=>"Zahir", "lastName"=>"Alam", "Age"=>25, "Company"=>"Switchme", "Role"=>"Developer", "Department"=>"Tech" ,"Head"=> array("Id"=>3 , "Name"=>"Sourasis Roy") ) , 1=> array("employee_id"=>2, "firstName"=>"Amith", "lastName"=>"Manniken", "Age"=>25, "Company"=>"Switchme", "Role"=>"Developer", "Department"=>"Tech" ,"Head"=> array("Id"=>3 , "Name"=>"Sourasis Roy") ) , 2=> array("employee_id"=>3, "firstName"=>"Sourasis", "lastName"=>"Roy", "Age"=>28, "Company"=>"Switchme", "Role"=>"CTO") , 3=> array("employee_id"=>4, "firstName"=>"Aditya", "lastName"=>"Mishra", "Age"=>29, "Company"=>"Switchme", "Department"=>"Tech", "Role"=>"CEO") , 4=> array("employee_id"=>5, "firstName"=>"Priti", "lastName"=>"Lata", "Age"=>24, "Company"=>"Switchme", "Role"=>"HR") , 5=> array("employee_id"=>6, "firstName"=>"Sumita", "lastName"=>"Nath", "Age"=>24, "Company"=>"Switchme", "Role"=>"HLA Head", "Department"=>"Crm") , 6=> array("employee_id"=>7, "firstName"=>"Tarini", "lastName"=>"Khanna", "Age"=>22, "Company"=>"Switchme", "Role"=>"Content Writer") , 7=> array("employee_id"=>8, "firstName"=>"Abhisek", "lastName"=>"Soni", "Age"=>23, "Company"=>"Switchme", "Role"=>"HLA", "Department"=>"Crm","Head"=>array("Id"=>5 , "Name"=>"Sumita Nath") ) , 8=> array("employee_id"=>9, "firstName"=>"Ankit", "lastName"=>"Pump", "Age"=>23, "Company"=>"Switchme", "Role"=>"HLA", "Department"=>"Crm" ,"Head"=> array("Id"=>5 , "Name"=>"Sumita Nath") ) , 9=> array("employee_id"=>10, "firstName"=>"Pogo", "lastName"=>"Laal", "Age"=>23, "Company"=>"Switchme", "Role"=>"Designer") , 10=> array("employee_id"=>11, "firstName"=>"Sabina", "lastName"=>"Sekh", "Age"=>28, "Company"=>"Switchme", "Role"=>"HLA Head", "Department"=>"Crm") , 11=> array("employee_id"=>12, "firstName"=>"Sanjay", "lastName"=>"Poudal", "Age"=>24, "Company"=>"Switchme", "Role"=>"HLA Head", "Department"=>"Crm" ,"Head"=> array("Id"=>10 , "Name"=>"Sabina Sekh") ) , ); $employee_salary = array ( 7=> array("employee_id"=>7, "salary"=>"55,000" ) , 2=> array("employee_id"=>2, "salary"=>"60,000" ) , 9=> array("employee_id"=>9, "salary"=>"50,000" ) , 10=> array("employee_id"=>10, "salary"=>"30,000" ) , ); $employee = array_column($employee, null, "employee_id"); $employee_salary = array_column($employee_salary, "salary", "employee_id"); foreach($employee_salary as $key => $v){ $employee[$key]['salary'] = $v; } var_dump($employee);