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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 |
|---|---|
| 3170 | $file = get_attached_file( $file ); |
| 3171 | |
| 3172 | if ( ! is_file( $file ) ) |
| 3173 | return sprintf(__('File “%s” doesn’t exist?'), $file); |
| 3174 | |
| 3175 | if ( ! function_exists('imagecreatefromstring') ) |
| 3176 | return __('The GD image library is not installed.'); |
| 3177 | |
| 3178 | // Set artificially high because GD uses uncompressed images in memory |
| 3179 | @ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
| 3180 | $image = imagecreatefromstring( file_get_contents( $file ) ); |
| 3181 | |
| 3182 | if ( !is_resource( $image ) ) |
| 3183 | return sprintf(__('File “%s” is not an image.'), $file); |
| 3184 | |
| 3185 | return $image; |
| 3186 | } |
| 3187 | |
| 3188 | /** |