Question

I am writing a simple script php.
This script has to know if a specified category passed via $_get exist in wordpress cms.

exist.php?cat=xxx

I have read this but I am not sure if it can help me.
http://codex.wordpress.org/Function_Reference/is_category

Can anyone help me?
How can I do?
Thanks.

Answer 1

Since it looks like you are trying to access it from a separate PHP file, connect to the WordPress database in your script and run this query:

<?php
include 'wp-config.php';

$dbh = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASSWORD);

$stmt = $dbh->prepare( "SELECT * FROM `wp_term_taxonomy` TT RIGHT JOIN `wp_terms` TE ON TT.`term_id` = TE.`term_id` WHERE TT.`taxonomy` = 'category' AND TE.`name` = :category" );
$stmt->bindParam( ':category', $_GET['cat'] );
$stmt->execute();

if ( $row = $stmt->fetch() ) {
    // It exists
} else {
    // It does not exist
}