<?php
$array = [
'mytv' => '2017',
'event' => 'old',
];
$newArray = [];
foreach ($array as $key => $value) {
$newArray[$key . ':='] = $value;
}
PD9waHAKCiRhcnJheSA9IFsKCSdteXR2JyA9PiAnMjAxNycsCgknZXZlbnQnID0+ICdvbGQnLApdOwokbmV3QXJyYXkgPSBbXTsKZm9yZWFjaCAoJGFycmF5IGFzICRrZXkgPT4gJHZhbHVlKSB7CgkkbmV3QXJyYXlbJGtleSAuICc6PSddID0gJHZhbHVlOwp9CmVjaG8ganNvbl9lbmNvZGUoJG5ld0FycmF5KTs=