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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 |
|---|---|
| 141 | * |
| 142 | * @param mixed $pre_option The value to return instead of the option value. This differs |
| 143 | * from `$default`, which is used as the fallback value in the event |
| 144 | * the option doesn't exist elsewhere in get_option(). |
| 145 | * Default false (to skip past the short-circuit). |
| 146 | * @param string $option Name of the option. |
| 147 | * @param mixed $default The fallback value to return if the option does not exist. |
| 148 | * Default false. |
| 149 | */ |
| 150 | $pre = apply_filters( 'pre_option', $pre, $option, $default ); |
| 151 | |
| 152 | if ( false !== $pre ) { |
| 153 | return $pre; |
| 154 | } |
| 155 | |
| 156 | if ( defined( 'WP_SETUP_CONFIG' ) ) { |
| 157 | return false; |
| 158 | } |
| 159 | |