Size Limit for PHP scripts

Is there a limit to the size of PHP scripts? I'm having a problem in which scriptA.php is including() scriptB.php, which then requires() scriptC.php. The result is that PHP itself dies. If I remove some code from scriptA.php to reduce the size of the script, it works fine. (The code that I'm removing wasn't being executed during this testing, so the code itself wasn't the problem.) If there is some limit, is there a parameter I can set to change it? Here's my setup: PHP 4.0.4 pl1 iPlanet 4.1 sp5 Solaris 2.7 Sun ES 250, 1GB RAM Thanks, Wally Hartshorn