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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 |
|---|---|
| 200 | |
| 201 | /** |
| 202 | * Filters the generated attachment meta data. |
| 203 | * |
| 204 | * @since 2.1.0 |
| 205 | * |
| 206 | * @param array $metadata An array of attachment meta data. |
| 207 | * @param int $attachment_id Current attachment ID. |
| 208 | */ |
| 209 | return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id ); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Convert a fraction string to a decimal. |
| 214 | * |
| 215 | * @since 2.5.0 |
| 216 | * |
| 217 | * @param string $str |
| 218 | * @return int|float |