*crash* on try to find out how many nesting levels are allowed

I wanted to find out how many nesting levels are allowed, but after class "a" gets instanciated from inside of "b", PHP crashes, that should not be. This code crashes PHP 4.0.1pl2, if someone could verify this... $level=1; class a { function a() { global $level; print $level; // if ($level==3) die(); $level++; new b(); } } class b { function b() { global $level; print $level; $level++; new a(); }} new a(); -- o----------0-¬---------O-·---¬----o---®-----o o O ° . | http://www.kiffen.de | pRoteçt y0ur bRaín |0 O ° ¤ ° · 0°·³°²'²³-¹'³´³°^°³~³²³°'³²²¨³²^³¹³²°²³`³º³°Þ ° o © ° . · | psychedelic experience | gott@kiffen.de | O ° o ° o-¬--o--0-----©-·--O-----o-----0-¤----------o 0 ° · ° . ¤ ·