How to get posts by content?

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I found the following codes to get post details.
However, it is not possible to get the posts by content.
Does any one has any ideas?

get_posts()

//// get post ////
$args = array(
    'numberposts'     => -1, // number of posts to display; display all: -1.
    'offset'          => 0,
    // 'category'        => , // post category ID
    'orderby'         => 'post_date',
    'order'           => 'DESC', // Latest post first: 'ASC'; Olderest post first: 'DESC'
    // 'include'         => ,
    // 'exclude'         => ,
    // 'meta_key'        => ,
    // 'meta_value'      => ,
    'post_type'       => 'post', // get post type
    // 'post_mime_type'  => ,
    // 'post_parent'     => ,
    // 'post_status'     => 'publish'
);

// http://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters
$posts_array = get_posts( $args );
foreach( $posts_array as $post ) : setup_postdata($post);
    echo "<li><a href="" . the_permalink() . "">" . the_title() .
         "</a>" .
         $post->blog_ID . 
         $post->post_date . 
         $post->post_title . 
         $post->pubtimes . 
         $post->post_author . 
         $post->post_content . 
         $post->post_excerpt . 
         $post->post_status;
        "</li>";
endforeach;

2 Answers
2

You have to extend the db query to search in the post_content column. There is a filter: 'posts_where' you can use.

I would write a simple wrapper for get_posts() to extends its arguments an run the filter once. Example:

class T5_Posts_By_Content
{
    protected static $content="";

    protected static $like    = TRUE;

    /**
     * Mapper for get_posts() with extra arguments 'content' and 'like'
     *
     * 'content' must be a string with optional '%' for free values.
     * 'like' must be TRUE or FALSE.
     *
     * @param array $args See get_posts.
     * @return array
     */
    public static function get( $args )
    {
        if ( isset ( $args['content'] ) )
        {
            // This is TRUE by default for get_posts().
            // We need FALSE to let the WHERE filter do its work.
            $args['suppress_filters'] = FALSE;
            self::$content            = $args['content'];
            add_filter( 'posts_where', array ( __CLASS__, 'where_filter' ) );
        }

        isset ( $args['like'] ) and self::$like = (bool) $like;

        return get_posts( $args );
    }

    /**
     * Changes the WHERE clause.
     *
     * @param string $where
     * @return string
     */
    public static function where_filter( $where )
    {
        // Make sure we run this just once.
        remove_filter( 'posts_where', array ( __CLASS__, 'where_filter' ) );

        global $wpdb;
        $like  = self::$like ? 'LIKE' : 'NOT LIKE';
        // Escape the searched text.
        $extra = $wpdb->prepare( '%s', self::$content );

        // Reset vars for the next use.
        self::$content="";
        self::$like    = TRUE;

        return "$where AND post_content $like $extra";
    }
}

To find the last five posts containing the string resized write:

$args = array(
    'content' => '%resized%'
);
$posts = T5_Posts_By_Content::get( $args );

To get the last five posts not containing resized:

$args = array(
    'content' => '%resized%',
    'like'    => FALSE
);
$posts = T5_Posts_By_Content::get( $args );

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