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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 |
|---|---|
| 3331 | * @param string $version The version of WordPress that deprecated the file |
| 3332 | * @param string $replacement Optional. The file that should have been included based on ABSPATH |
| 3333 | * @param string $message Optional. A message regarding the change |
| 3334 | */ |
| 3335 | function _deprecated_file( $file, $version, $replacement = null, $message = '' ) { |
| 3336 | |
| 3337 | do_action( 'deprecated_file_included', $file, $replacement, $version, $message ); |
| 3338 | |
| 3339 | // Allow plugin to filter the output error trigger |
| 3340 | if ( WP_DEBUG && apply_filters( 'deprecated_file_trigger_error', true ) ) { |
| 3341 | $message = empty( $message ) ? '' : ' ' . $message; |
| 3342 | if ( ! is_null( $replacement ) ) |
| 3343 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) . $message ); |
| 3344 | else |
| 3345 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) . $message ); |
| 3346 | } |
| 3347 | } |
| 3348 | /** |
| 3349 | * Marks a function argument as deprecated and informs when it has been used. |