php add to associative array

1// for php 5.4+
2$data += [$key => $value];
3
4// for php 5.4-
5$data += array($key => $value);

1<?php 
2/* 
3There are 3 Types of array in php  
41. Indexed arrays - Arrays with a numeric index
52. Associative arrays - Arrays with named keys
63. Multidimensional arrays - Arrays containing one or more arrays
7
8This is the second one - Associative arrays
9*/
10
11$age = array("Samy"=>"35", "Naveen"=>"37", "Amit"=>"43");
12echo "Mr.Samy is " . $age['Samy'] . " years old.";
13
14?>

1
2$a1=['aa'=>'123' , 'bb'=>'454'];
3
4$a1 = array_merge( $a1 , ['a'=>1,'b'=>2] ) ;
5

1$a = array('foo' => 'bar'); // when you create
2$a['Title'] = 'blah'; // later
3

1$data[$category][] = $item;