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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 |
|---|---|
| 243 | /** |
| 244 | * Filters Twenty Nineteen custom colors CSS. |
| 245 | * |
| 246 | * @since Twenty Nineteen 1.0 |
| 247 | * |
| 248 | * @param string $css Base theme colors CSS. |
| 249 | * @param int $primary_color The user's selected color hue. |
| 250 | * @param string $saturation Filtered theme color saturation level. |
| 251 | */ |
| 252 | return apply_filters( 'twentynineteen_custom_colors_css', $css, $primary_color, $saturation ); |
| 253 | } |
| 254 | |