To add a pair to a pair array:

Use the [pair] method to create a new pair and the [array->insert] method to insert it at the end of an array. The following example adds a new name/value pair to the end of an array of pairs describing some guy.

Code

var( someGuy = array( 'Last_Name' = 'Doe', 'Sex' = 'Male', 'Height' = '188cm') )
var( newPair = pair('First_Name', 'John') )
$someGuy->insert( $newPair )

$someGuy

Result

array((Last_Name = Doe), (Sex = Male), (Height = 188cm), (First_Name = John))