filesize function is crashing the Apache server

On using filesize is PHP is crashing the apache server.

No error is seen in the log file but window event viewer shows

Faulting application Apache.exe, version 2.0.63.200, 开发者_运维知识库faulting module php_iisfunc.dll, version 5.2.7.7, fault address 0x00001085.

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Why is the php_iisfunc module activated in the first place?

Can you try deactivating it in your php.ini?