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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 |
|---|---|
| 218 | |
| 219 | /** |
| 220 | * Filter the default image compression quality setting. |
| 221 | * |
| 222 | * @since 3.5.0 |
| 223 | * |
| 224 | * @param int $quality Quality level between 1 (low) and 100 (high). |
| 225 | * @param string $mime_type Image mime type. |
| 226 | */ |
| 227 | $quality = apply_filters( 'wp_editor_set_quality', $quality, $this->mime_type ); |
| 228 | |
| 229 | if ( 'image/jpeg' == $this->mime_type ) { |
| 230 | /** |
| 231 | * Filter the JPEG compression quality for backward-compatibility. |
| 232 | * |
| 233 | * The filter is evaluated under two contexts: 'image_resize', and 'edit_image', |
| 234 | * (when a JPEG image is saved to file). |
| 235 | * |
| 236 | * @since 2.5.0 |