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I was browsing around the PHP online manual (the single best resource for learning about PHP) and I came up with several things that I didn't know about that were pretty interesting.

1. Alternate syntax for control structures (if, while, etc)

   <?php $a = "b";
   if($a == "a"): ?>
   a = a
   <?php elseif($a == "b"): ?>
   a = b
   <?php else: ?>
   a = ?
   <?php endif; ?>

2. Changing modified and accessed time of a file

   touch("fake.txt", time()-1*60*60*24*365, time()-1*60*60*24*365);

3. Highlighting a file for PHP syntax with one line

   highlight_file('file.php');

Actually, I already knew about all of these, I just wanted to share