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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 |
|---|---|
| 3410 | * @param string $version The version of WordPress that deprecated the file |
| 3411 | * @param string $replacement Optional. The file that should have been included based on ABSPATH |
| 3412 | * @param string $message Optional. A message regarding the change |
| 3413 | */ |
| 3414 | function _deprecated_file( $file, $version, $replacement = null, $message = '' ) { |
| 3415 | |
| 3416 | do_action( 'deprecated_file_included', $file, $replacement, $version, $message ); |
| 3417 | |
| 3418 | // Allow plugin to filter the output error trigger |
| 3419 | if ( WP_DEBUG && apply_filters( 'deprecated_file_trigger_error', true ) ) { |
| 3420 | $message = empty( $message ) ? '' : ' ' . $message; |
| 3421 | if ( ! is_null( $replacement ) ) |
| 3422 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) . $message ); |
| 3423 | else |
| 3424 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) . $message ); |
| 3425 | } |
| 3426 | } |
| 3427 | /** |
| 3428 | * Marks a function argument as deprecated and informs when it has been used. |