Below is the uploadify plugins , here I want to use code for validate image dimension(width and height) before upload.
<script> $(function() { $("#file_upload_1").uploadify({ height : 30, swf : '/uploadify/uploadify.swf', uploader : '/uploadify/uploadify.php', width : 120 }); }); </script>
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Answer
You get the size of the image on this line:
$size = getimagesize($pathToFullImage);
Why not add a conditional here to check if it is at least the size you want, and if not return an error.
if($size[0] > 150 || $size[1] > 150) { return $someError; }
Also it looks like there is an onError option for Uploadify which you could set: http://www.uploadify.com/documentation/
EDIT: This thread looks like it could be of some help to you: http://www.uploadify.com/forum/viewtopic.php?f=5&t=14