[英]Wordpress query with variable in SQL
為什么此代碼給出空數組:
$category = 3;
$man = 'HP';
$query_join = $wpdb->get_results('SELECT wp_products.product_manufacturer
FROM wp_products
JOIN wp_categories
ON wp_products.category_id=wp_categories.id
WHERE ' . $category . ' = wp_products.category_id
AND ' . $man . ' = wp_products.product_manufacturer
');
var_dump($query_join);
這段代碼為數組提供了一個結果:
$category = 3;
$query_join = $wpdb->get_results('SELECT wp_products.product_manufacturer
FROM wp_products
JOIN wp_categories
ON wp_products.category_id=wp_categories.id
WHERE ' . $category . ' = wp_products.category_id
AND "HP" = wp_products.product_manufacturer
');
var_dump($query_join);
我如何處理第一個代碼中的變量以獲得類似secound的結果?
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