<?php

$wgHooks1 = [
	'Foo' => [ 
		'X::onFoo',
		'Y::onFoo',
		[ 'myFoo', [ 'n' => 1, 'm' => 2, 3 ] ]
	],
	'Bar' => [ 
		'X::onBar',
		'Y::onBar',
		[ 'myBar', [ 'n' => 11, 'm' => 12, 13 ] ]
	],
];

$wgHooks2 = [
	'Foo' => [ 
		'A::onFoo',
		'B::onFoo',
		[ 'yourFoo', [ 'n' => 1, 'm' => 2, 3 ] ]
	],
	'Bar' => [ 
		'A::onBar',
		'B::onBar',
		[ 'yourBar', [ 'n' => 21, 'm' => 22, 23 ] ]
	],
];

print "\n\narray_merge:\n";
var_export( array_merge( $wgHooks1, $wgHooks2 ) );

print "\n\narray_merge_recursive:\n";
var_export( array_merge_recursive( $wgHooks1, $wgHooks2 ) );

print "\n\narray_replace_recursive:\n";
var_export( array_replace_recursive( $wgHooks1, $wgHooks2 ) );