How to add elements to php associative array

How to add elements to an associative array in php: 1. Use the array_merge() function to merge two associative arrays to add elements. The syntax is "array_merge(associative array 1, associative array 2)"; 2. Use " " Operator, combines two associative arrays to add elements, the syntax is "associative array 1 associative array 2".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

1. Use the array_merge() function

<?php
$queue = array(&#39;a&#39;, &#39;B&#39;);
$queue = array_merge(array(&#39;front&#39; => &#39;hello&#39;), $queue);
print_r($queue);
?>

Output:

Array ( [front] => hello [0] => a [1] => B )

Description:

array_merge() function can merge one or more arrays into one array.

2. Use the " " operator

<?php
$queue = array(&#39;a&#39;, &#39;B&#39;);
$queue = array(&#39;front&#39; => &#39;Hello&#39;) + $queue;
print_r($queue);
?>

Output:

Array ( [front] => Hello [0] => a [1] => B )

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