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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 |
---|---|
3289 | * @uses apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do |
3290 | * trigger or false to not trigger error. |
3291 | * |
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 | } |