source: trunk/www.guidonia.net/wp/wp-content/plugins/contact-form-7/includes/pipe.php@ 44

<?php

class WPCF7_Pipe {

        var $before = '';
        var $after = '';

        function WPCF7_Pipe( $text ) {
                $pipe_pos = strpos( $text, '|' );
                if ( false === $pipe_pos ) {
                        $this->before = $this->after = $text;
                } else {
                        $this->before = substr( $text, 0, $pipe_pos );
                        $this->after = substr( $text, $pipe_pos + 1 );
                }
        }
}

class WPCF7_Pipes {

        var $pipes = array();

        function WPCF7_Pipes( $texts ) {
                if ( ! is_array( $texts ) )
                        return;

                foreach ( $texts as $text ) {
                        $this->add_pipe( $text );
                }
        }

        function add_pipe( $text ) {
                $pipe = new WPCF7_Pipe( $text );
                $this->pipes[] = $pipe;
        }

        function do_pipe( $before ) {
                foreach ( $this->pipes as $pipe ) {
                        if ( $pipe->before == $before )
                                return $pipe->after;
                }
                return $before;
        }

        function collect_befores() {
                $befores = array();

                foreach ( $this->pipes as $pipe ) {
                        $befores[] = $pipe->before;
                }

                return $befores;
        }

        function zero() {
                return empty( $this->pipes );
        }

        function random_pipe() {
                if ( $this->zero() )
                        return null;

                return $this->pipes[array_rand( $this->pipes )];
        }
}

?>