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if x, foreach x

Here's another winner I found in actual (PHP) code that I was working on: 
if ($groups) {
 foreach($groups as $group) {
  /* ... */
 }
}
Good thing they wrapped that foreach loop in that if, eh? We wouldn't have wanted to waste time looping through the whole (empty) array, if the array were empty in the first place, now would we?? :-D
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