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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 |
---|---|
109 | /** |
110 | * Filter the image sizes automatically generated when uploading an image. |
111 | * |
112 | * @since 2.9.0 |
113 | * @since 4.4.0 Added the `$metadata` argument. |
114 | * |
115 | * @param array $sizes An associative array of image sizes. |
116 | * @param array $metadata An associative array of image metadata: width, height, file. |
117 | */ |
118 | $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes, $metadata ); |
119 |
|
120 | if ( $sizes ) { |
121 | $editor = wp_get_image_editor( $file ); |
122 |
|
123 | if ( ! is_wp_error( $editor ) ) |
124 | $metadata['sizes'] = $editor->multi_resize( $sizes ); |
125 | } else { |
126 | $metadata['sizes'] = array(); |
127 | } |