wp_attachment_is

Verifies an attachment is of a given type.

Description

wp_attachment_is( (string) $type, (null) $post = null ); 

Parameters (2)

0. $type (string)
Attachment type. Accepts image,, audio., or video.
1. $post — Optional. (null) => null
Attachment ID or object. Default is global $post.

Usage

  1. if ( !function_exists( 'wp_attachment_is' ) ) { 
  2.     require_once ABSPATH . WPINC . '/post.php'; 
  3. } 
  4.   
  5. // Attachment type. Accepts 'image', 'audio', or 'video'. 
  6. $type = ''; 
  7.   
  8. // Optional. Attachment ID or object. Default is global $post. 
  9. $post = null; 
  10.   
  11. // NOTICE! Understand what this does before running. 
  12. $result = wp_attachment_is($type, $post); 
  13.     

Defined (1)

The function is defined in the following location(s).

/wp-includes/post.php  
  1. function wp_attachment_is( $type, $post = null ) { 
  2.     if ( ! $post = get_post( $post ) ) { 
  3.         return false; 
  4.     } 
  5.  
  6.     if ( ! $file = get_attached_file( $post->ID ) ) { 
  7.         return false; 
  8.     } 
  9.  
  10.     if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) { 
  11.         return true; 
  12.     } 
  13.  
  14.     $check = wp_check_filetype( $file ); 
  15.     if ( empty( $check['ext'] ) ) { 
  16.         return false; 
  17.     } 
  18.  
  19.     $ext = $check['ext']; 
  20.  
  21.     if ( 'import' !== $post->post_mime_type ) { 
  22.         return $type === $ext; 
  23.     } 
  24.  
  25.     switch ( $type ) { 
  26.     case 'image': 
  27.         $image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' ); 
  28.         return in_array( $ext, $image_exts ); 
  29.  
  30.     case 'audio': 
  31.         return in_array( $ext, wp_get_audio_extensions() ); 
  32.  
  33.     case 'video': 
  34.         return in_array( $ext, wp_get_video_extensions() ); 
  35.  
  36.     default: 
  37.         return $type === $ext; 
  38.     } 
  39. }