mysql_list_processes

<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');

$result = mysql_list_processes($link);
while ($row = mysql_fetch_row($result)){
    printf("%s %s %s %s %s\n", $row["Id"], $row["Host"], $row["db"],
       $row["Command"], $row["Time"]);
}
mysql_free_result ($result);
?>