Updated PHP version for PHP7.2+

Removed PHP5 (no longer supported)
Renamed PHP7 to PHP - consistent with other kata
Added the same helpers as other PHP Kata
Updated the code to PHP7.2+ standard
Didn't change GildedRose updateQuality method
Updated GildedRoseTest (still failing)
Added ApprovalTest (passing)
- same text file as texttests / ThirtyDays / stdout.gr (only renamed).

php/fixtures/texttest_fixture.php

@@ -0,0 +1,38 @@
+<?php
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+use GildedRose\GildedRose;
+use GildedRose\Item;
+
+echo "OMGHAI!" . PHP_EOL;
+
+$items = array(
+    new Item('+5 Dexterity Vest', 10, 20),
+    new Item('Aged Brie', 2, 0),
+    new Item('Elixir of the Mongoose', 5, 7),
+    new Item('Sulfuras, Hand of Ragnaros', 0, 80),
+    new Item('Sulfuras, Hand of Ragnaros', -1, 80),
+    new Item('Backstage passes to a TAFKAL80ETC concert', 15, 20),
+    new Item('Backstage passes to a TAFKAL80ETC concert', 10, 49),
+    new Item('Backstage passes to a TAFKAL80ETC concert', 5, 49),
+    // this conjured item does not work properly yet
+    new Item('Conjured Mana Cake', 3, 6)
+);
+
+$app = new GildedRose($items);
+
+$days = 2;
+if (count($argv) > 1) {
+    $days = (int) $argv[1];
+}
+
+for ($i = 0; $i < $days; $i++) {
+    echo("-------- day $i --------" . PHP_EOL);
+    echo("name, sellIn, quality" . PHP_EOL);
+    foreach ($items as $item) {
+        echo $item . PHP_EOL;
+    }
+    echo PHP_EOL;
+    $app->updateQuality();
+}