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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 |
---|---|
130 | * |
131 | * @since 2.9.0 |
132 | * @since 4.4.0 Added the `$metadata` argument. |
133 | * @since 5.1.0 Added the `$attachment_id` argument. |
134 | * |
135 | * @param array $sizes An associative array of image sizes. |
136 | * @param array $metadata An associative array of image metadata: width, height, file. |
137 | * @param int $attachment_id Current attachment ID. |
138 | */ |
139 | $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes, $metadata, $attachment_id ); |
140 |
|
141 | if ( $sizes ) { |
142 | $editor = wp_get_image_editor( $file ); |
143 |
|
144 | if ( ! is_wp_error( $editor ) ) { |
145 | $metadata['sizes'] = $editor->multi_resize( $sizes ); |
146 | } |
147 | } else { |
148 | $metadata['sizes'] = array(); |