PHP: Add an Approval base test similar to Java-Approvals and CS-xunit-verify.

php/fixtures/texttest_fixture.php

@@ -30,7 +30,7 @@ if ((is_countable($argv) ? count($argv) : 0) > 1) {
 }
 
 for ($i = 0; $i < $days; $i++) {
-    echo "-------- day ${i} --------" . PHP_EOL;
+    echo "-------- day {$i} --------" . PHP_EOL;
     echo 'name, sellIn, quality' . PHP_EOL;
     foreach ($items as $item) {
         echo $item . PHP_EOL;