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Meta Query Example

// WP_Query arguments
$args = array (
	'posts_per_page'         => '-1',
	'order'                  => 'ASC',
	'orderby'                => 'date',
	'meta_query'             => array(
		array(
			'key'       => 'im_a_key',
			'value'     => '123abc',
		),
	),
);

// The Query
$query = new WP_Query( $args );

// The Loop
if ( $query->have_posts() ) {
	while ( $query->have_posts() ) {
		$query->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();