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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 |
|---|---|
| 979 | * @type string $function Optional. A function name to test for the existence of. |
| 980 | * @type string $extension Optional. An extension to check if is loaded in PHP. |
| 981 | * @type string $constant Optional. A constant name to check for to verify an extension exists. |
| 982 | * @type string $class Optional. A class name to check for to verify an extension exists. |
| 983 | * @type bool $required Is this a required feature or not. |
| 984 | * @type string $fallback_for Optional. The module this module replaces as a fallback. |
| 985 | * } |
| 986 | * } |
| 987 | */ |
| 988 | $modules = apply_filters( 'site_status_test_php_modules', $modules ); |
| 989 | |
| 990 | $failures = array(); |
| 991 | |
| 992 | foreach ( $modules as $library => $module ) { |
| 993 | $extension = ( isset( $module['extension'] ) ? $module['extension'] : null ); |
| 994 | $function = ( isset( $module['function'] ) ? $module['function'] : null ); |
| 995 | $constant = ( isset( $module['constant'] ) ? $module['constant'] : null ); |
| 996 | $class_name = ( isset( $module['class'] ) ? $module['class'] : null ); |
| 997 | |