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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 |
|---|---|
| 544 | * |
| 545 | * The filter is evaluated for all image sizes except 'full'. |
| 546 | * |
| 547 | * @since 3.1.0 |
| 548 | * |
| 549 | * @param string $path Path to the current image. |
| 550 | * @param string $attachment_id Attachment ID. |
| 551 | * @param string $size Size of the image. |
| 552 | */ |
| 553 | $filepath = apply_filters( 'load_image_to_edit_filesystempath', path_join( dirname( $filepath ), $data['file'] ), $attachment_id, $size ); |
| 554 | } |
| 555 | } elseif ( function_exists( 'fopen' ) && function_exists( 'ini_get' ) && true == ini_get( 'allow_url_fopen' ) ) { |
| 556 | /** |
| 557 | * Filter the image URL if not in the local filesystem. |
| 558 | * |
| 559 | * The filter is only evaluated if fopen is enabled on the server. |
| 560 | * |
| 561 | * @since 3.1.0 |
| 562 | * |