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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 |
|---|---|
| 120 | /** |
| 121 | * Filters the image sizes automatically generated when uploading an image. |
| 122 | * |
| 123 | * @since 2.9.0 |
| 124 | * @since 4.4.0 Added the `$metadata` argument. |
| 125 | * |
| 126 | * @param array $sizes An associative array of image sizes. |
| 127 | * @param array $metadata An associative array of image metadata: width, height, file. |
| 128 | */ |
| 129 | $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes, $metadata ); |
| 130 | |
| 131 | if ( $sizes ) { |
| 132 | $editor = wp_get_image_editor( $file ); |
| 133 | |
| 134 | if ( ! is_wp_error( $editor ) ) |
| 135 | $metadata['sizes'] = $editor->multi_resize( $sizes ); |
| 136 | } else { |
| 137 | $metadata['sizes'] = array(); |
| 138 | } |