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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 |
|---|---|
| 91 | $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes |
| 92 | else |
| 93 | $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options |
| 94 | if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) ) |
| 95 | $sizes[$s]['crop'] = intval( $_wp_additional_image_sizes[$s]['crop'] ); // For theme-added sizes |
| 96 | else |
| 97 | $sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options |
| 98 | } |
| 99 | |
| 100 | $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes ); |
| 101 | |
| 102 | if ( $sizes ) { |
| 103 | $editor = wp_get_image_editor( $file ); |
| 104 | |
| 105 | if ( ! is_wp_error( $editor ) ) |
| 106 | $metadata['sizes'] = $editor->multi_resize( $sizes ); |
| 107 | } else { |
| 108 | $metadata['sizes'] = array(); |
| 109 | } |