Adding a row title to a csv created with PHP? -


i have php creating csv file myself, i'm looking see if it's possible create row titles (latitude , longitude) on files creation, not in subsequent updates of file.

    <?php     $myfile = "locationlog";     $fh = fopen($myfile, 'a') or die("can't open file");     fwrite($fh, "\r\n");     fwrite($fh, str_replace( array( 'lat=', '&lon=' ), array( '', ',' ), file_get_contents('php://input')));     fclose($fh);     echo "<html><head /><body><iframe src=\"$myfile\" style=\"height:100%; width:100%;\"></iframe></body></html>"  ?>

this code creates file this:

55.0203786,-7.1819549 55.0204016,-7.1819482 55.0204016,-7.1819482 55.0203927,-7.1819593 55.0203927,-7.1819593

but i'm looking create file this: 

latitude,longitude 55.0203786,-7.1819549 55.0204016,-7.1819482 55.0204016,-7.1819482 55.0203927,-7.1819593 55.0203927,-7.1819593

i've tried manually putting titles in, seems stop php script updating file again.

edit:

i've tried using filesize method.

<?php     $myfile = "locationlog";     $fh = fopen($myfile, 'a') or die("can't open file");     fwrite($fh, "\r\n");     if(filesize($file) == 0) { fwrite($fh, "latitude,longitude\r\n"); }     elseif(filesize($file) > 0){         fwrite($fh, str_replace( array( 'lat=', '&lon=' ), array( '', ',' ), file_get_contents('php://input')));     }     fclose($fh);     echo "<html><head /><body><iframe src=\"$myfile\" style=\"height:100%; width:100%;\"></iframe></body></html>"  ?>

it seems have opposite effect, showing result:

latitude,longitude  latitude,longitude  latitude,longitude  latitude,longitude

i'm doing wrong.

edit 2:

i figured out eventually. help! here's script, in case needs in future.

<?php     $myfile = "locationlog";     if(filesize(locationlog) == 0) {      $fh = fopen($myfile, 'a') or die("can't open file");     fwrite($fh, "latitude,longitude");     }     $fh = fopen($myfile, 'a') or die("can't open file");     fwrite($fh, "\r\n");     fwrite($fh, str_replace( array( 'lat=', '&lon=' ), array( '', ',' ), file_get_contents('php://input')));     fclose($fh);     echo "<html><head /><body><iframe src=\"$myfile\" style=\"height:100%; width:100%;\"></iframe></body></html>"  ?>

after 

fwrite($fh, "\r\n");

add

fwrite($fh, "latitude,longitude\r\n");

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