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grid loading from php. Incorrect XML

Hi, I keep getting incorrect xml when loading the grid. it loads fine if the file is a .xml file. but not if it's a simple php file like below.
rfrankingGrid.loadXML("rankings.php");

<?php
header("Content-type:text/xml");
    print("<?xml version=\"1.0\"?>");
print("<rows>");
        print("<row id='0'>");
                    print("<cell>");
                    print("1");
                    print("</cell>");
                    print("<cell>");
                    print("2");
                    print("</cell>");
                    print("<cell>");
                    print("3");
                    print("</cell>");
                    print("<cell>");
                    print("4");
                    print("</cell>");
                    print("<cell>");
                    print("5");
                    print("</cell>");
        print("</row>");
        print("</rows>");        
?>        

The same code works correctly in case of local test ( attached )
Please try to use debug version of dhtmlxcommon and check that server side script doesn't generate any errors in your case.
    http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Common_Problems_in_Grid.html#grid_art_comprob