Get all post by post meta key and meta value using meta_query in WP_Query(). Read more at https://wp.me/p4Ams0-14E

get-post-by-meta-key-and-meta-value.php

<?php
/**
 * Get all post by post meta key and meta value.
 * 
 * @todo Change the `prefix_` and with your own unique prefix.
 * 
 * @since 1.0.0
 */
if( ! function_exists( 'prefix_search_post_by_post_meta_value' ) ) :
	function prefix_search_post_by_post_meta_value() {
		
		$query_args = array(
			'post_type'      => 'post',
		
			// Query performance optimization.
			'fields'         => 'ids',
			'no_found_rows'  => true,
			'posts_per_page' => -1,
			'meta_query'     => array(
			    array(
					'key'   => 'my-meta-key',
					'value' => 'my-meta-value',
			    ),
			)
		);
		
		$query = new WP_Query( $query_args );

		if ( $query->posts ) {
			foreach ( $query->posts as $key => $post_id ) {
				// var_dump( $post_id );
				// Code goes here..
			}
		}
   }
   add_action( 'admin_head', 'prefix_search_post_by_post_meta_value' );
endif;