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wp_embed_register_handler( 'github-gist', '#https?://gist\.github\.com/([0-9]+)#', 'gist_embed_handler' );
add_shortcode( 'gist', 'gist_shortcode' );
function gist_embed_handler( $matches, $attr, $url, $rawattr ) {
  return gist_shortcode( $attr, $url );
}
function gist_shortcode( $atts, $content = '' ) {
  if ( empty( $atts[0] ) && empty( $content ) )
    return '<!-- Missing Gist ID -->';
  $id = ( ! empty( $content ) ) ? $content : $atts[0];
  if ( ! is_numeric( $id ) )

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<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7">

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if (!is_admin()) add_action( 'wp_enqueue_scripts', 'my_jquery_enqueue', 11 );
function my_jquery_enqueue() {
  wp_deregister_script( 'jquery' );
	wp_register_script( 'jquery', get_template_directory_uri() . '/js/jquery.js', false, null );
	wp_enqueue_script( 'jquery' );
}

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remove_action( 'wp_head', 'wp_generator' );

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RewriteEngine On
RewriteCond %{HTTP_REFERER} !^http://(.+\.)?mysite\.com/ [NC]
RewriteCond %{HTTP_REFERER} !^$
RewriteRule .*\.(jpe?g|gif|bmp|png)$ /images/nohotlink.jpg [L]

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in functions.php:
function wp_opengraph_for_posts() {
    if ( is_singular() ) {
        global $post;
        setup_postdata( $post );
        $output = '<meta property="og:type" content="article" />' . "\n";
        $output .= '<meta property="og:title" content="' . esc_attr( get_the_title() ) . '" />' . "\n";
        $output .= '<meta property="og:url" content="' . get_permalink() . '" />' . "\n";
        $output .= '<meta property="og:description" content="' . esc_attr( get_the_excerpt() ) . '" />' . "\n";
        if ( has_post_thumbnail() ) {

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add_filter('jpeg_quality', function($arg){return 100;});