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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 |
|---|---|
| 151 | |
| 152 | if ( $max < 0 || $metadata['width'] * $metadata['height'] < $max ) { |
| 153 | $max_side = apply_filters( 'wp_thumbnail_max_side_length', 128, $attachment_id, $file ); |
| 154 | $thumb = wp_create_thumbnail( $file, $max_side ); |
| 155 | |
| 156 | if ( @file_exists($thumb) ) |
| 157 | $metadata['thumb'] = basename($thumb); |
| 158 | } |
| 159 | } |
| 160 | return apply_filters( 'wp_generate_attachment_metadata', $metadata ); |
| 161 | } |
| 162 | |
| 163 | function wp_load_image( $file ) { |
| 164 | if ( ctype_digit( $file ) ) |
| 165 | $file = get_attached_file( $file ); |
| 166 | |
| 167 | if ( !file_exists( $file ) ) |
| 168 | return sprintf(__("File '%s' doesn't exist?"), $file); |
| 169 | |