Question: how to convert excel file to csv file using php?
Answer: function excel_csv_to_csv($in_file, $out_file) {
if( !$ ... 
$fw = fopen($out_file, "w");
while( ($data = fgetcsv($fr, 1000, ",")) !== FALSE ) {
foreach( array_keys($data) as $key )
$data[$key] = '"' . ... 
$line = implode(",", $data) . " ... 
fwrite($fw, $line);