防止WordPress站点被别人通过iframe框架引用

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// Break Out of Frames for WordPress
function break_out_of_frames() {
     if (!is_preview()) {
          echo "\n<script type=\"text/javascript\">";
          echo "\n<!--";
          echo "\nif (parent.frames.length > 0) { parent.location.href = location.href; }";
          echo "\n-->";
          echo "\n</script>\n\n";
     }
}
add_action('wp_head', 'break_out_of_frames');