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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 |
|---|---|
| 3222 | $file = get_attached_file( $file ); |
| 3223 | |
| 3224 | if ( ! is_file( $file ) ) |
| 3225 | return sprintf(__('File “%s” doesn’t exist?'), $file); |
| 3226 | |
| 3227 | if ( ! function_exists('imagecreatefromstring') ) |
| 3228 | return __('The GD image library is not installed.'); |
| 3229 | |
| 3230 | // Set artificially high because GD uses uncompressed images in memory |
| 3231 | @ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
| 3232 | $image = imagecreatefromstring( file_get_contents( $file ) ); |
| 3233 | |
| 3234 | if ( !is_resource( $image ) ) |
| 3235 | return sprintf(__('File “%s” is not an image.'), $file); |
| 3236 | |
| 3237 | return $image; |
| 3238 | } |
| 3239 | |
| 3240 | /** |