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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 |
|---|---|
| 1016 | function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id = 0 ) { |
| 1017 | /** |
| 1018 | * Let plugins pre-filter the image meta to be able to fix inconsistencies in the stored data. |
| 1019 | * |
| 1020 | * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'. |
| 1021 | * @param array $size_array Array of width and height values in pixels (in that order). |
| 1022 | * @param string $image_src The 'src' of the image. |
| 1023 | * @param int $attachment_id The image attachment ID or 0 if not supplied. |
| 1024 | */ |
| 1025 | $image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id ); |
| 1026 | |
| 1027 | if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) { |
| 1028 | return false; |
| 1029 | } |
| 1030 | |
| 1031 | $image_sizes = $image_meta['sizes']; |
| 1032 | |
| 1033 | // Get the width and height of the image. |
| 1034 | $image_width = (int) $size_array[0]; |