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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 |
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1309 | * @type int $value The source width if paired with a 'w' descriptor, or a |
1310 | * pixel density value if paired with an 'x' descriptor. |
1311 | * } |
1312 | * } |
1313 | * @param array $size_array Array of width and height values in pixels (in that order). |
1314 | * @param string $image_src The 'src' of the image. |
1315 | * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'. |
1316 | * @param int $attachment_id Image attachment ID or 0. |
1317 | */ |
1318 | $sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id ); |
1319 |
|
1320 | // Only return a 'srcset' value if there is more than one source. |
1321 | if ( ! $src_matched || ! is_array( $sources ) || count( $sources ) < 2 ) { |
1322 | return false; |
1323 | } |
1324 |
|
1325 | $srcset = ''; |
1326 |
|
1327 | foreach ( $sources as $source ) { |