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<?php |
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/** |
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* Class Jetpack_Shortcode_Unavailable |
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*/ |
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class Jetpack_Shortcode_Unavailable { |
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/** |
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* Set up the actions and filters for the class to listen to. |
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* |
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* @param array $shortcodes An associative array of keys being the shortcodes that are unavailable, and a string explaining why. |
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*/ |
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public function __construct( $shortcodes ) { |
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$this->shortcodes = $shortcodes; |
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add_action( 'template_redirect', array( $this, 'add_shortcodes' ) ); |
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} |
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/** |
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* For all of our defined unavailable shortcodes, if something else hasn't |
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* already claimed them, add a handler to nullify their output. |
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*/ |
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public function add_shortcodes() { |
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foreach ( $this->shortcodes as $shortcode => $message ) { |
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if ( ! shortcode_exists( $shortcode ) ) { |
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add_shortcode( $shortcode, array( $this, 'stub_shortcode' ) ); |
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} |
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} |
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} |
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/** |
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* Nullify the output of unavailable shortcodes. Includes a filter to make |
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* it easier to notify admins that a shortcode that they used is unavailable. |
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* |
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* @param $atts |
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* @param string $content |
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* @param string $shortcode |
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* @return mixed|void |
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*/ |
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public function stub_shortcode( $atts, $content = '', $shortcode = '' ) { |
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$str = ''; |
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if ( current_user_can( 'edit_posts' ) && ! empty( $this->shortcodes[ $shortcode ] ) ) { |
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$str = sprintf( '<div><strong>%s</strong></div>', $this->shortcodes[ $shortcode ] ); |
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} |
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/** |
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* Filter the front-end output of unavailable shortcodes. |
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* |
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* @module shortcodes |
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* |
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* @since 4.5.0 |
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* |
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* @param string $str The html displayed in lieu of the shortcode. |
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* @param array $atts The attributes (numeric or named) passed to the shortcode. |
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* @param string $content The content (if any) between the opening and closing tags. |
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* @param string $shortcode The shortcode tag used to invoke this. |
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*/ |
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return apply_filters( 'jetpack_stub_shortcode', $str, $atts, $content, $shortcode ); |
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} |
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} |
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new Jetpack_Shortcode_Unavailable( array( |
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'blip.tv' => __( 'The Blip.tv service has been shut down since August 20th, 2015.', 'jetpack' ), |
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) ); |
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Automattic /
jetpack
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: