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add_action( 'add_meta_boxes', 'custom_meta_boxes' );
add_action( 'save_post', 'ExtraImageProperty_save' );

function custom_meta_boxes() {
	add_meta_box('ExtraImageProperty', 'Extra Image Property', 'ExtraImageProperty', 'page');
}

function ExtraImageProperty() {
	global $post;
  $extra_image_url = get_post_meta($post->ID, 'extra_image_url', true);

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function get_attachment_id_from_src ($src) {
  global $wpdb;
  $reg = "/-[0-9]+x[0-9]+?.(jpg|jpeg|png|gif)$/i";
  $src1 = preg_replace($reg,'',$src);
  if($src1 != $src){
      $ext = pathinfo($src, PATHINFO_EXTENSION);
      $src = $src1 . '.' .$ext;
  }
  $query = "SELECT ID FROM {$wpdb->posts} WHERE guid='$src'";
  $id = $wpdb->get_var($query);

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tar -c --bzip2 -f foo.tar.bz1 foo/

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$myValue = '123';

// First you need to set the visual value, then you need to set it selected, this is retarted
$('#myselect').val($myValue).attr("selected", "selected");

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sed 's/old/new/g' input.txt > output.txt

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split -d -b 4300m backup.tar.bz2 backup.tar.bz2.

cat backup.tar.bz2.* > backup.tar.bz2

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git tag -a v0.2.1 12edf74 -m "First internal release"
git push origin v0.2.1

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/<\s*\/?\s*[p,span]\s*.*?>/g

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<?php
add_filter( 'post_thumbnail_html', 'remove_thumbnail_dimensions', 10 );
add_filter( 'image_send_to_editor', 'remove_thumbnail_dimensions', 10 );
add_filter( 'the_content', 'remove_thumbnail_dimensions', 10 );

function remove_thumbnail_dimensions( $html ) {
  $html = preg_replace( '/(width|height)=\"\d*\"\s/', "", $html );
  return $html;
}
?>

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// there is a solution for jQuery < 1.9.0, where you can use `$.browser`:
// https://gist.github.com/nathansmith/950767

// but jQuery removed `$.browser` in version 1.9.0, so you have to get another way:

function last_child() {
    if (/msie [1-8]{1}[^0-9]/.test(navigator.userAgent.toLowerCase())) {
        $('*:last-child').addClass('last-child');
    }
}