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Wordpress get Page content By Page ID

<?php if(!function_exists('getPageContent')) { function getPageContent($pageId,$max_char) { if(!is_numeric($pageId)) { return; } global $wpdb; $nsquery = 'SELECT DISTINCT * FROM ' . $wpdb->posts . ' WHERE ' . $wpdb->posts . '.ID=' . $pageId; $post_data = $wpdb->get_results($nsquery); if(!empty($post_data)) { foreach($post_data as $post) { $text_out=nl2br($post->post_content); $text_out=str_replace(']]>', ']]>', $text_out); $text_out = strip_tags($text_out); return substr($text_out,0,$max_char); } } } } ?> How to Call function getPageContent? <?php echo getPageContent(11,150); //First parameter is PAGE ID and second is number of words displayed. ?>