white space fore php tag
While a blank line before the <?php start tag may look innocent, when processed by PHP, it will turn into an echo statement printing out a blank line.
If working with web service wrapper scripts from mapserver this could be a disaster resulting in some strange behaviours like:
1) After $request->loadparams(); the script will send you an empty file as a reply
2) If the $request has uses setparameters, all the outputs will be dumped to the browser window, for example a WMS GetMap request will be a binary string in the browser window.
3) The ms_iogetStdoutBufferBytes(); will return nothing if you want to save the image locally.
4) Output with Warning: Cannot modify header information - headers already sent by
These symptoms are caused by the existence of an open buffer cause by the blank line, at the begining of the php programming.
Labels: Cannot modify header information, mapserver, ms_iogetStdoutBufferBytes
posted by Mister Jesus @ 3:25 PM
1 Comments:
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