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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 |
|---|---|
| 229 | * |
| 230 | * The filter is evaluated under two contexts: 'image_resize', and 'edit_image', |
| 231 | * (when a JPEG image is saved to file). |
| 232 | * |
| 233 | * @since 2.5.0 |
| 234 | * |
| 235 | * @param int $quality Quality level between 0 (low) and 100 (high) of the JPEG. |
| 236 | * @param string $context Context of the filter. |
| 237 | */ |
| 238 | $quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' ); |
| 239 | |
| 240 | if ( ! $this->set_quality( $quality ) ) { |
| 241 | $this->quality = $this->default_quality; |
| 242 | } |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | return $this->quality; |
| 247 | } |