您可以使用the_content filter可过滤所有帖子内容并替换img源。

add_filter( \'the_content\', \'show_full_sized_images\' );
/**
 * Replaces all -600x999 images with full image url
 * @param string $content
 * @return string
 */
function show_full_sized_images( $content ) {

    $pattern = \'~(http[^\\\'"]*)(-600x[0-9]{2,4})(\\.jpe?g|png|gif)~i\';

    $m = preg_match_all( $pattern, $content, $matches );

    echo \'<pre>\' . esc_html( print_r( $matches, 1 ) ) . \'</pre>\';

    return preg_replace( $pattern, \'$1$3\', $content );
}

img {
    width: auto;
    height: auto;
}