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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 |
|---|---|
| 1250 | * @param int[] $size_array { |
| 1251 | * An array of requested width and height values. |
| 1252 | * |
| 1253 | * @type int $0 The width in pixels. |
| 1254 | * @type int $1 The height in pixels. |
| 1255 | * } |
| 1256 | * @param string $image_src The 'src' of the image. |
| 1257 | * @param int $attachment_id The image attachment ID or 0 if not supplied. |
| 1258 | */ |
| 1259 | $image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id ); |
| 1260 | |
| 1261 | if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) { |
| 1262 | return false; |
| 1263 | } |
| 1264 | |
| 1265 | $image_sizes = $image_meta['sizes']; |
| 1266 | |
| 1267 | // Get the width and height of the image. |
| 1268 | $image_width = (int) $size_array[0]; |