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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 |
|---|---|
| 149 | wp_update_attachment_metadata( $sub_attachment_id, $attach_data ); |
| 150 | update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id ); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | // remove the blob of binary data from the array |
| 155 | if ( isset( $metadata['image']['data'] ) ) |
| 156 | unset( $metadata['image']['data'] ); |
| 157 | |
| 158 | return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id ); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Convert a fraction string to a decimal. |
| 163 | * |
| 164 | * @since 2.5.0 |
| 165 | * |
| 166 | * @param string $str |
| 167 | * @return int|float |