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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 |
|---|---|
| 109 | } |
| 110 | |
| 111 | // fetch additional metadata from exif/iptc |
| 112 | $image_meta = wp_read_image_metadata( $file ); |
| 113 | if ( $image_meta ) |
| 114 | $metadata['image_meta'] = $image_meta; |
| 115 | |
| 116 | } |
| 117 | |
| 118 | return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id ); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Convert a fraction string to a decimal. |
| 123 | * |
| 124 | * @since 2.5.0 |
| 125 | * |
| 126 | * @param string $str |
| 127 | * @return int|float |