How Can I Efficiently Export MySQL Query Results to a CSV File Using PHP?

Exporting MySQL Query Results to CSV in PHP

Question:

What's the best method for efficiently converting a MySQL query to a CSV file in PHP?

Answer:

There are multiple approaches to exporting MySQL query results to CSV using PHP:

1. Using MySQL's SELECT INTO OUTFILE:

This method allows you to directly output the query results to a CSV file, without using temp files:

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

Refer to the MySQL documentation for more details.

2. Manual Export and Formatting:

You can perform the export and formatting manually using PHP:

$select = "SELECT * FROM table_name";

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

$fields = mysql_num_fields($export);

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

// Generate data
while ($row = mysql_fetch_row($export)) {
    $line = '';
    foreach ($row as $value) {
        // Handle empty values
        if (empty($value)) {
            $value = "\t";
        } else {
            // Escape double quotes
            $value = str_replace('"', '""', $value);
            $value = '"' . $value . '"' . "\t";
        }
        $line .= $value;
    }
    $data .= trim($line) . "\n";
}

// Remove leading/trailing whitespace
$data = str_replace("\r", "", $data);

// Send headers and output CSV
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=your_desired_name.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";

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