string yp_match(string domain, string map, string key);yp_match() returns the value associated with the passed key out of the specified map or FALSE. This key must be exact.
| Example 1. Example for NIS match <?php
    $entry = yp_match($domain, "passwd.byname", "joe");
    if(!$entry) {
        echo yp_errno() . ": " . yp_err_string();
    }
    echo "Matched entry is: " . $entry;
?>
       | 
In this case this could be: joe:##joe:11111:100:Joe User:/home/j/joe:/usr/local/bin/bash
See also: yp_get_default_domain yp_errno and yp_err_string