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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 |
|---|---|
| 2205 | |
| 2206 | if ( $max < 0 || $metadata['width'] * $metadata['height'] < $max ) { |
| 2207 | $max_side = apply_filters( 'wp_thumbnail_max_side_length', 128, $attachment_id, $file ); |
| 2208 | $thumb = wp_create_thumbnail( $file, $max_side ); |
| 2209 | |
| 2210 | if ( @file_exists($thumb) ) |
| 2211 | $metadata['thumb'] = basename($thumb); |
| 2212 | } |
| 2213 | } |
| 2214 | return apply_filters( 'wp_generate_attachment_metadata', $metadata ); |
| 2215 | } |
| 2216 | |
| 2217 | function wp_create_thumbnail( $file, $max_side, $effect = '' ) { |
| 2218 | |
| 2219 | // 1 = GIF, 2 = JPEG, 3 = PNG |
| 2220 | |
| 2221 | if ( file_exists( $file ) ) { |
| 2222 | $type = getimagesize( $file ); |
| 2223 | |