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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 509 | function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) { |
| 510 | |
| 511 | // get a thumbnail or intermediate image if there is one |
| 512 | if ( $image = image_downsize($attachment_id, $size) ) |
| 513 | return $image; |
| 514 | |
| 515 | $src = false; |
| 516 | |
| 517 | if ( $icon && $src = wp_mime_type_icon($attachment_id) ) { |
| 518 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' ); |
| 519 | $src_file = $icon_dir . '/' . wp_basename($src); |
| 520 | @list($width, $height) = getimagesize($src_file); |
| 521 | } |
| 522 | if ( $src && $width && $height ) |
| 523 | return array( $src, $width, $height ); |
| 524 | return false; |
| 525 | } |
| 526 | |
| 527 | /** |