PHP excel xml report creating using loops

[Dominyka]

hello, I making xml to excel report using by php. I sow problem and can't fix it. when i use loop like this for ($i=1; $i<5; $i++){ echo" $i"; } everthing generate ok, but if i use for ($i=1; $i<11; $i++){ echo" $i"; } everthing is stoping and broke excel report generation. How need to fix it? please help.. thanks in advance