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Call the functions added to a filter hook. See the Plugin API for a list of filter hooks.
The callback functions attached to filter hook $tag are invoked by calling this function. This function can be used to create a new filter hook by simply calling this function with the name of the new hook specified using the $tag parameter.
<?php apply_filters( $tag, $value, $var ... ); ?>
Note: The type of return should be the same as the type of $value: a string or an array, for example.
echo apply_filters( $tag, $value );
$myvar = apply_filters( $tag, $value );
$myvar = apply_filters( $tag, $value, $param, $otherparam );
$my_custom_title = apply_filters('the_title', ' My Custom Title (tm) ');
$my_custom_title will now contain 'My Custom Title ™', since the_title filter applies wptexturize() and trim(), among others.
apply_filters() is located in wp-includes/plugin.php.
Filters: has_filter(), add_filter(), apply_filters(), current_filter(), merge_filters(), remove_filter(), remove_all_filters()