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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 |
|---|---|
| 130 | } |
| 131 | |
| 132 | // fetch additional metadata from exif/iptc |
| 133 | $image_meta = wp_read_image_metadata( $file ); |
| 134 | if ( $image_meta ) |
| 135 | $metadata['image_meta'] = $image_meta; |
| 136 | |
| 137 | } |
| 138 | |
| 139 | return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id ); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Load an image from a string, if PHP supports it. |
| 144 | * |
| 145 | * @since 2.1.0 |
| 146 | * |
| 147 | * @param string $file Filename of the image to load. |
| 148 | * @return resource The resulting image resource on success, Error string on failure. |