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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 |
|---|---|
| 49 | * |
| 50 | * @param bool|mixed $pre_option The value to return instead of the option value. This differs from |
| 51 | * `$default`, which is used as the fallback value in the event the option |
| 52 | * doesn't exist elsewhere in get_option(). Default false (to skip past the |
| 53 | * short-circuit). |
| 54 | * @param string $option Option name. |
| 55 | * @param mixed $default The fallback value to return if the option does not exist. |
| 56 | * Default is false. |
| 57 | */ |
| 58 | $pre = apply_filters( "pre_option_{$option}", false, $option, $default ); |
| 59 | |
| 60 | if ( false !== $pre ) |
| 61 | return $pre; |
| 62 | |
| 63 | if ( defined( 'WP_SETUP_CONFIG' ) ) |
| 64 | return false; |
| 65 | |
| 66 | // Distinguish between `false` as a default, and not passing one. |
| 67 | $passed_default = func_num_args() > 1; |