Automatically Remove Links from WordPress Images

index.php

// Automatically Remove Links from WordPress Images
add_filter( 'the_content', 'attachment_image_link_remove_filter' );

function attachment_image_link_remove_filter( $content ) {
	$content = preg_replace( array( '{<a(.*?)(wp-att|wp-content/uploads)[^>]*><img}', '{ wp-image-[0-9]*" /></a>}' ),
	array( '<img','" />' ), $content );
	return $content;
}