How-to-generate-an-xlsx-using-php

$file = "test.csv";
 header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
 header('Content-Disposition: attachment; filename='.$file);
 $content = "Col1,Col2,Col3\n";
 $content .= "test1,test1,test3\n";
 $content .= "testtest,ttesttest2,testtest3\n";
 echo $content;

Source: stackoverflow.com

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