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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 |
|---|---|
| 7033 | * Filters the URL to learn more about updating the PHP version the site is running on. |
| 7034 | * |
| 7035 | * Providing an empty string is not allowed and will result in the default URL being used. Furthermore |
| 7036 | * the page the URL links to should preferably be localized in the site language. |
| 7037 | * |
| 7038 | * @since 5.1.0 |
| 7039 | * |
| 7040 | * @param string $update_url URL to learn more about updating PHP. |
| 7041 | */ |
| 7042 | $update_url = apply_filters( 'wp_update_php_url', $update_url ); |
| 7043 | |
| 7044 | if ( empty( $update_url ) ) { |
| 7045 | $update_url = $default_url; |
| 7046 | } |
| 7047 | |
| 7048 | return $update_url; |
| 7049 | } |
| 7050 | |
| 7051 | /** |