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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 |
|---|---|
| 91 | $imagesize = getimagesize( $file ); |
| 92 | $metadata['width'] = $imagesize[0]; |
| 93 | $metadata['height'] = $imagesize[1]; |
| 94 | list($uwidth, $uheight) = wp_shrink_dimensions($metadata['width'], $metadata['height']); |
| 95 | $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'"; |
| 96 | $metadata['file'] = $file; |
| 97 | |
| 98 | // make thumbnails and other intermediate sizes |
| 99 | $sizes = array('thumbnail', 'medium'); |
| 100 | $sizes = apply_filters('intermediate_image_sizes', $sizes); |
| 101 | |
| 102 | foreach ($sizes as $size) { |
| 103 | $resized = image_make_intermediate_size( $file, get_option("{$size}_size_w"), get_option("{$size}_size_h"), get_option("{$size}_crop") ); |
| 104 | if ( $resized ) |
| 105 | $metadata['sizes'][$size] = $resized; |
| 106 | } |
| 107 | |
| 108 | // fetch additional metadata from exif/iptc |
| 109 | $image_meta = wp_read_image_metadata( $file ); |