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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 |
|---|---|
| 320 | function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) { |
| 321 | |
| 322 | if ($orig_w <= 0 || $orig_h <= 0) |
| 323 | return false; |
| 324 | // at least one of dest_w or dest_h must be specific |
| 325 | if ($dest_w <= 0 && $dest_h <= 0) |
| 326 | return false; |
| 327 | |
| 328 | // plugins can use this to provide custom resize dimensions |
| 329 | $output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop ); |
| 330 | if ( null !== $output ) |
| 331 | return $output; |
| 332 | |
| 333 | if ( $crop ) { |
| 334 | // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h |
| 335 | $aspect_ratio = $orig_w / $orig_h; |
| 336 | $new_w = min($dest_w, $orig_w); |
| 337 | $new_h = min($dest_h, $orig_h); |
| 338 | |