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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 |
|---|---|
| 4138 | /** |
| 4139 | * Fires when the given function is being used incorrectly. |
| 4140 | * |
| 4141 | * @since 3.1.0 |
| 4142 | * |
| 4143 | * @param string $function The function that was called. |
| 4144 | * @param string $message A message explaining what has been done incorrectly. |
| 4145 | * @param string $version The version of WordPress where the message was added. |
| 4146 | */ |
| 4147 | do_action( 'doing_it_wrong_run', $function, $message, $version ); |
| 4148 | |
| 4149 | /** |
| 4150 | * Filters whether to trigger an error for _doing_it_wrong() calls. |
| 4151 | * |
| 4152 | * @since 3.1.0 |
| 4153 | * |
| 4154 | * @param bool $trigger Whether to trigger the error for _doing_it_wrong() calls. Default true. |
| 4155 | */ |
| 4156 | if ( WP_DEBUG && apply_filters( 'doing_it_wrong_trigger_error', true ) ) { |