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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 |
|---|---|
| 3292 | * @param string $function The function that was called |
| 3293 | * @param string $version The version of WordPress that deprecated the function |
| 3294 | * @param string $replacement Optional. The function that should have been called |
| 3295 | */ |
| 3296 | function _deprecated_function( $function, $version, $replacement=null ) { |
| 3297 | |
| 3298 | do_action( 'deprecated_function_run', $function, $replacement, $version ); |
| 3299 | |
| 3300 | // Allow plugin to filter the output error trigger |
| 3301 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |
| 3302 | if ( ! is_null($replacement) ) |
| 3303 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) ); |
| 3304 | else |
| 3305 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) ); |
| 3306 | } |
| 3307 | } |
| 3308 | |
| 3309 | /** |
| 3310 | * Marks a file as deprecated and informs when it has been used. |