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WordPress

Dennis Eitner
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Dennis Eitner
Full Stack JavaScript Techdegree Graduate 25,644 Points
Posted by Dennis Eitner
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Dennis Eitner
Full Stack JavaScript Techdegree Graduate 25,644 Points

Function executed in every page but should only execute on a specific page

I have created a submenu page with a custom function that should export a csv file when clicking on it. If I return the function the function gets executed on every page. if i don't return the function, the csv export does not work.

I have no idea how to solve this. If anybody could help, would be great.

        add_action('admin_menu', 'register_my_shipping_export_page');

function register_my_shipping_export_page() {
add_submenu_page( 'woocommerce', 'Export list', 'Export List', 'manage_options', 'my-export-page', 'my_custom_export_page_callback' );


function my_custom_export_page_callback (){

$fileName = 'somefile.csv';

header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header('Content-Description: File Transfer');
header("Content-type: text/csv");
header("Content-Disposition: attachment; filename={$fileName}");
header("Expires: 0");
header("Pragma: public");

$fh = @fopen( 'php://output', 'w' );

global $wpdb;
$query = "SELECT * FROM `{$wpdb->prefix}my_table`";
$results = $wpdb->get_results( $query, ARRAY_A );

$headerDisplayed = false;

foreach ( $results as $data ) {
// Add a header row if it hasn't been added yet
if ( !$headerDisplayed ) {
// Use the keys from $data as the titles
fputcsv($fh, array_keys($data));
$headerDisplayed = true;
}

// Put the data into the stream
fputcsv($fh, $data);
}
// Close the file
fclose($fh);
// Make sure nothing else is sent, our file is done
exit;

}

return my_custom_export_page_callback(); 

}
Jeremy Castanza
Jeremy Castanza
12,081 Points
Jeremy Castanza
Jeremy Castanza
12,081 Points

I think your issue is related to the WP hierarchy. If you only want your function executed on a specific page, you could create a specific template for that page and pull the function from your functions.php file (assuming it's there) and put into into a page specific template (e.g. page-my-page-slug.php). For more info on how the hierarchy works, check out http://wphierarchy.com/