[mapserver-users] PHP Mapscript rendering incorrect/old? images

[Jeff McKenna]

Hi Lisa,

I have had problems like this before.  Here is what I did:

- added ob_clean() near end of my PHP scripts to flush out buffer
- saved temp image with rand() in filename, such as:
	$file = $oImage->save("ttt".rand().".png", $oMap);

I know it's not fancy, but it has worked for me.

-jeff


-- 
Jeff McKenna
MapServer Consulting and Training Services
https://gatewaygeomatics.com/



On 2019-01-22 7:03 PM, lisa wrote:
> Hello - I have been trying to solve an this issue for about a week now and I
> am hoping someone can give me some ideas on how to solve it.
> Here is the setup:
> Centos 6
> Apache 2.2.15
> PHP 5.3.3
> Mapserver 6.4.3
> 
> I have an old website that serves up weather related data. A crontab process
> downloads radar images from the national weather service and saves a sliding
> window of 3 hrs worth of them them as gifs (ex: n0r_t_m000.gif for the most
> current radar image). These gifs are defined as data sources for layers in a
> .map file like this:
> LAYER
>     NAME 'Radar_000'
>     TYPE RASTER
>     STATUS ON
>     DATA ../../../cache/radar/n0r/n0r_t_m000.gif
>     OFFSITE 255 255 255
>   END
> 
> A php script reads this map file and changes it, to turn on the layers it
> wants to display:
> $map = ms_newMapObj("../../mapserver/radar/radar.map");
> $radar_layer = $map->getLayerByName("Radar_000");
> $radar_layer->set("status", MS_ON);
> 
> It uses mapObj draw() to create an imageObj and then saveWebImage() to store
> that image in a temp file, like this:
> $image = $map->draw();
> $image_name = $image->saveWebImage();
> 
> The problem is that the temp file that is created IS NOT ALWAYS the correct
> image, as specified as the source data for that layer. It is sometimes an
> older version of the gif. I have double and triple checked that the source
> data is correct. I also printed out the map file, from the mapObj in the php
> script and used shp2img to generate an image, and that image IS ALWAYS
> CORRECT. I have also turned on Mapserver level 5 debugging, and CPL_DEBUG,
> but that did not help either.
> 
> Does anyone know what might be causing this or where else I can look to
> debug the problem?
> I can provide more info if needed.
> 
> Thanks very much!  - lisa
> 
>