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I use the ide for php coding and it shows the following as an error (red squiggle under the line): <div style="width:100%; background:url('<?php echo $test;?>') repeat-x; height:75px"></div> It's the "url" portion of the css with the inline php code. If you remove the single quotes, it stops marking the error. If you remove the php, it stops as well. But together is causes and "unexpected symbols ''" error.
I believe I've seen a bug report on this already...