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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 |
|---|---|
| 228 | * |
| 229 | * The filter is evaluated under two contexts: 'image_resize', and 'edit_image', |
| 230 | * (when a JPEG image is saved to file). |
| 231 | * |
| 232 | * @since 2.5.0 |
| 233 | * |
| 234 | * @param int $quality Quality level between 0 (low) and 100 (high) of the JPEG. |
| 235 | * @param string $context Context of the filter. |
| 236 | */ |
| 237 | $quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' ); |
| 238 | |
| 239 | // Allow 0, but squash to 1 due to identical images in GD, and for backwards compatibility. |
| 240 | if ( $quality == 0 ) { |
| 241 | $quality = 1; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | if ( ( $quality >= 1 ) && ( $quality <= 100 ) ){ |
| 246 | $this->quality = $quality; |