PHP Taskbook Level 7.6

Given a text file. Get the percentage of each character. Write the result to a new file.

The file contains Russian text. Open this file, convert the text to transliteration and write it to a new file.

Given a text file, shuffle the lines in this file in random order.

Get a list of all possible lucky tickets. A ticket is a string of six digits, possibly with leading zeros. A ticket is lucky if the sum of the first three digits equals the sum of the second three digits. Write the resulting list to a file, each ticket on a new line.

Write a program that will generate the following array:

[
	'x',
	'xx',
	'xxx',
	'xxxx',
	'xxxxx',
]

Given such an object:

<?php
	$data = [
		2018: [
			11: [
				29: [1, 2, 3],
				30: [4, 5],
			],
			12: [
				30: [6, 7],
				31: [8, 9],
			],
		],
		2019: [
			12: [
				29: [10, 11],
				30: [12, 13],
				31: [14, 15],
			]
		],
	]
?>

Write all the elements of this object into some array, like this:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]