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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 |
|---|---|
| 1810 | /** |
| 1811 | * Filters whether a "hard" rewrite rule flush should be performed when requested. |
| 1812 | * |
| 1813 | * A "hard" flush updates .htaccess (Apache) or web.config (IIS). |
| 1814 | * |
| 1815 | * @since 3.7.0 |
| 1816 | * |
| 1817 | * @param bool $hard Whether to flush rewrite rules "hard". Default true. |
| 1818 | */ |
| 1819 | if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) ) { |
| 1820 | return; |
| 1821 | } |
| 1822 | if ( function_exists( 'save_mod_rewrite_rules' ) ) { |
| 1823 | save_mod_rewrite_rules(); |
| 1824 | } |
| 1825 | if ( function_exists( 'iis7_save_url_rewrite_rules' ) ) { |
| 1826 | iis7_save_url_rewrite_rules(); |
| 1827 | } |
| 1828 | } |