Código PHP para convertir una consulta MySQL a CSV

Solución:

SELECT * INTO OUTFILE "c:/mydata.csv"
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY "n"
FROM my_table;

(la documentación para esto está aquí: http://dev.mysql.com/doc/refman/5.0/en/select.html)

o:

$select = "SELECT * FROM table_name";

$export = mysql_query ( $select ) or die ( "Sql error : " . mysql_error( ) );

$fields = mysql_num_fields ( $export );

for ( $i = 0; $i < $fields; $i++ )
{
    $header .= mysql_field_name( $export , $i ) . "t";
}

while( $row = mysql_fetch_row( $export ) )
{
    $line="";
    foreach( $row as $value )
    {                                            
        if ( ( !isset( $value ) ) || ( $value == "" ) )
        {
            $value = "t";
        }
        else
        {
            $value = str_replace( '"' , '""' , $value );
            $value=""" . $value . '"' . "t";
        }
        $line .= $value;
    }
    $data .= trim( $line ) . "n";
}
$data = str_replace( "r" , "" , $data );

if ( $data == "" )
{
    $data = "n(0) Records Found!n";                        
}

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=your_desired_name.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$headern$data";

Mira esta pregunta / respuesta. Es más conciso que el de @ Geoff y también usa la función fputcsv incorporada.

$result = $db_con->query('SELECT * FROM `some_table`');
if (!$result) die('Couldn't fetch records');
$num_fields = mysql_num_fields($result);
$headers = array();
for ($i = 0; $i < $num_fields; $i++) {
    $headers[] = mysql_field_name($result , $i);
}
$fp = fopen('php://output', 'w');
if ($fp && $result) {
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="export.csv"');
    header('Pragma: no-cache');
    header('Expires: 0');
    fputcsv($fp, $headers);
    while ($row = $result->fetch_array(MYSQLI_NUM)) {
        fputcsv($fp, array_values($row));
    }
    die;
}

Mire la documentación relacionada con la sintaxis SELECT … INTO OUTFILE.

SELECT a,b,a+b INTO OUTFILE '/tmp/result.txt'
  FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
  LINES TERMINATED BY 'n'
  FROM test_table;

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