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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 |
|---|---|
| 3519 | * Passing a non-null value in the 'url' member of the return array will |
| 3520 | * effectively short circuit get_avatar_data(), passing the value through |
| 3521 | * the {@see 'get_avatar_data'} filter and returning early. |
| 3522 | * |
| 3523 | * @since 4.2.0 |
| 3524 | * |
| 3525 | * @param array $args Arguments passed to get_avatar_data(), after processing. |
| 3526 | * @param int|object|string $id_or_email A user ID, email address, or comment object. |
| 3527 | */ |
| 3528 | $args = apply_filters( 'pre_get_avatar_data', $args, $id_or_email ); |
| 3529 | |
| 3530 | if ( isset( $args['url'] ) && ! is_null( $args['url'] ) ) { |
| 3531 | /** This filter is documented in wp-includes/link-template.php */ |
| 3532 | return apply_filters( 'get_avatar_data', $args, $id_or_email ); |
| 3533 | } |
| 3534 | |
| 3535 | $email_hash = ''; |
| 3536 | $user = $email = false; |
| 3537 | |