php add values of a key in an associative array 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 array push key value

<?php
$image[0] = $image[0].','.$filename;
?>