PHP code to write to a CSV file for Microsoft Applications

By: Soapergem @ gmail . com Emailed: 1612 times Printed: 2080 times    

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I've created a function for quickly generating CSV files that work with Microsoft applications. In the field I learned a few things about generating CSVs that are not always obvious. First, since PHP is generally *nix-based, it makes sense that the line endings are always \n instead of \r\n. However, certain Microsoft programs (I'm looking at you, Access 97), will fail to recognize the CSV properly unless each line ends with \r\n. So this function changes the line endings accordingly. Secondly, if the first column heading / value of the CSV file begins with uppercase ID, certain Microsoft programs (ahem, Excel 2007) will interpret the file as being in the SYLK format rather than CSV, as described here: http://support.microsoft.com/kb/323626

This function accommodates for that as well, by forcibly enclosing that first value in quotes (when this doesn't occur automatically). It would be fairly simple to modify this function to use another delimiter if need be and I leave that as an exercise to the reader. So quite simply, this function is used for outputting CSV data to a CSV file in a way that is safe for use with Windows applications. It takes two parameters + one optional parameter: the location of where the file should be saved, an array of data rows, and an optional array of column headings. (Technically you could omit the headings array and just include it as the first row of the data, but it is often useful to keep this data stored in different arrays in practice.)

<?php 

function mssafe_csv($filepath, $data, $header = array()) 
{ 
    if ( $fp = fopen($filepath, 'w') ) { 
        $show_header = true; 
        if ( empty($header) ) { 
            $show_header = false; 
            reset($data); 
            $line = current($data); 
            if ( !empty($line) ) { 
                reset($line); 
                $first = current($line); 
                if ( substr($first, 0, 2) == 'ID' && !preg_match('/["\\s,]/', $first) ) { 
                    array_shift($data); 
                    array_shift($line); 
                    if ( empty($line) ) { 
                        fwrite($fp, "\"{$first}\"\r\n"); 
                    } else { 
                        fwrite($fp, "\"{$first}\","); 
                        fputcsv($fp, $line); 
                        fseek($fp, -1, SEEK_CUR); 
                        fwrite($fp, "\r\n"); 
                    } 
                } 
            } 
        } else { 
            reset($header); 
            $first = current($header); 
            if ( substr($first, 0, 2) == 'ID' && !preg_match('/["\\s,]/', $first) ) { 
                array_shift($header); 
                if ( empty($header) ) { 
                    $show_header = false; 
                    fwrite($fp, "\"{$first}\"\r\n"); 
                } else { 
                    fwrite($fp, "\"{$first}\","); 
                } 
            } 
        } 
        if ( $show_header ) { 
            fputcsv($fp, $header); 
            fseek($fp, -1, SEEK_CUR); 
            fwrite($fp, "\r\n"); 
        } 
        foreach ( $data as $line ) { 
            fputcsv($fp, $line); 
            fseek($fp, -1, SEEK_CUR); 
            fwrite($fp, "\r\n"); 
        } 
        fclose($fp); 
    } else { 
        return false; 
    } 
    return true; 
} 

?>

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