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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 |
|---|---|
| 1420 | * An array of requested width and height values. |
| 1421 | * |
| 1422 | * @type int $0 The width in pixels. |
| 1423 | * @type int $1 The height in pixels. |
| 1424 | * } |
| 1425 | * @param string $image_src The 'src' of the image. |
| 1426 | * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'. |
| 1427 | * @param int $attachment_id Image attachment ID or 0. |
| 1428 | */ |
| 1429 | $sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id ); |
| 1430 | |
| 1431 | // Only return a 'srcset' value if there is more than one source. |
| 1432 | if ( ! $src_matched || ! is_array( $sources ) || count( $sources ) < 2 ) { |
| 1433 | return false; |
| 1434 | } |
| 1435 | |
| 1436 | $srcset = ''; |
| 1437 | |
| 1438 | foreach ( $sources as $source ) { |