download file from an ajax request

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hi everybody!

Hi!

is there some way to allow downloading a PHP generated file from an ajax
request?
the simple code below generates the image but not prompts the "save or open
file..." (it works if I call it directly, not from an HTML and using
ajax...)

thanks,
Pere

$layer=$_GET['params'];  //coming from ajax request
$image0="http://edit3.csic.es/geoserver/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SERVICE=WMS&LAYERS=".$layer."&STYLES=&format=image/png&bbox=-9.65,35.6,4.85,43.85&WIDTH=760&HEIGHT=380&SLD=http://edit.csic.es/fitxers/sld/pou.sld";;
$image=imagecreatefrompng($image0);
imagepng($image,'definitius_hola.png');  

//Opens file or URL
$h = fopen("definitius.png", "r");
	header("Content-Type: image/png");
	header("Content-Disposition: attachment; filename=\"definitius.png");
	fpassthru($h);
	fclose($h);
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