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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 |
|---|---|
| 108 | $whitelist_options['general'][] = 'WPLANG'; |
| 109 | |
| 110 | /** |
| 111 | * Filter whether the post-by-email functionality is enabled. |
| 112 | * |
| 113 | * @since 3.0.0 |
| 114 | * |
| 115 | * @param bool $enabled Whether post-by-email configuration is enabled. Default true. |
| 116 | */ |
| 117 | if ( apply_filters( 'enable_post_by_email_configuration', true ) ) |
| 118 | $whitelist_options['writing'] = array_merge($whitelist_options['writing'], $mail_options); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Filter the options white list. |
| 123 | * |
| 124 | * @since 2.7.0 |
| 125 | * |
| 126 | * @param array White list options. |