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PHP Taskbook Level 8.2

Given some URL:

$url = 'http://test.com/dir1/dir2/dir3/page.html';

Get the page name from it:

'page.html';

Given an array, the subarrays of which contain numbers:

[
	[1, 2, 3],
	[4, 5, 6],
	[7, 8, 9],
]

Merge the elements of this array into numbers:

[123, 456, 789]

Display the following pyramid on the screen:

xx
xxxx
xxxxxx
xxxxxxxx
xxxxxxxxxx