It took me about an hour to spot a strange behaviour in my PHP skript:
Have a look at this code:
$foo = array ( 'a', 'b', 'c' ); foreach ( $foo as $bar ); echo $bar . "\n"; // Expected Output: // a // b // c // Actual Output: // c
Would I have used phpcs it would have been obvious. I used a semicolon instead of a bracket after the foreach statement.
So instead of calling the echo command with each iteration the foreach silently iterated through $foo and assigned $bar on each iteration. That left $bar with the last value of the array that gave the strange output.
I can not actually remember whether there had been closing brackets but I did not get an Error regarding that.
phpcs would have detected the missing brackets — if that would be observed by the used sniff.
More on phpcs later.