how to add key and value in associative array in php code example

Example 1: php add to associative array

// for php 5.4+
$data += [$key => $value];

// for php 5.4-
$data += array($key => $value);

Example 2: php add to existing associative array

$a1=['aa'=>'123' , 'bb'=>'454'];

$a1 = array_merge( $a1 , ['a'=>1,'b'=>2] ) ;

Example 3: php add new item to associative array

$a = array('foo' => 'bar'); // when you create
$a['Title'] = 'blah'; // later