- array_diff_assoc: documentation ( source)
- var_dump: documentation ( source)
<?php
$source_packages = array(
'one' => array ('param1' => 'val11', 'param2' => 'val21'),
'two' => array ('param1' => 'val11', 'param2' => 'val22')
);
$packages_from = $source_packages;
$package_key = 'two';
$package_value = $source_packages[$package_key];
$packages_to = array($package_key => $package_value);
$result_packages = array_diff_assoc($packages_from, $packages_to);
var_dump($result_packages); echo "\n";