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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 |
|---|---|
| 1020 | * - `gif` |
| 1021 | * - `webp` |
| 1022 | * |
| 1023 | * @since 5.6.0 |
| 1024 | * @since 5.8.0 Added 'webp' to the default list of allowed file extensions. |
| 1025 | * |
| 1026 | * @param string[] $allowed_extensions Array of allowed file extensions. |
| 1027 | * @param string $file The URL of the image to download. |
| 1028 | */ |
| 1029 | $allowed_extensions = apply_filters( 'image_sideload_extensions', $allowed_extensions, $file ); |
| 1030 | $allowed_extensions = array_map( 'preg_quote', $allowed_extensions ); |
| 1031 | |
| 1032 | // Set variables for storage, fix file filename for query strings. |
| 1033 | preg_match( '/[^\?]+\.(' . implode( '|', $allowed_extensions ) . ')\b/i', $file, $matches ); |
| 1034 | |
| 1035 | if ( ! $matches ) { |
| 1036 | return new WP_Error( 'image_sideload_failed', __( 'Invalid image URL.' ) ); |
| 1037 | } |
| 1038 | |