You'll need to install MSVC6 and you'll also need to
If you downloaded the debug-pack from the snaps site, extract it into your PHP directory and be sure to put the PDB files that belong to the extensions into your extension directory.
If you compile PHP by your own, you can also use a newer version of MSVS.
When PHP crashes, click Cancel to debug the process. Now MSVC starts up in Debug View. If you don't already see the call stack, go into the View menu and choose Debug Windows → Call Stack.
You'll now see something similar to the following lines, this is the backtrace:
_efree(void * 0x00000000) line 286 + 3 bytes zif_http_test(int 0, _zval_struct * 0x007bc3b0, _zval_struct * * 0x00000000, _zval_struct * 0x00000000, int 0, void * * * 0x00792cd0) line 1685 + 8 bytes zend_do_fcall_common_helper_SPEC(_zend_execute_data * 0x0012fd6c, void * * * 0x00792cd0) line 188 + 95 bytes ZEND_DO_FCALL_SPEC_CONST_HANDLER(_zend_execute_data * 0x0012fd6c, void * * * 0x00792cd0) line 1578 + 13 bytes execute(_zend_op_array * 0x007bc880, void * * * 0x00792cd0) line 88 + 13 bytes zend_eval_string(char * 0x00793bce, _zval_struct * 0x00000000, char * 0x00404588 `string', void * * * 0x00792cd0) line 1056 + 14 bytes zend_eval_string_ex(char * 0x00793bce, _zval_struct * 0x00000000, char * 0x00404588 `string', int 1, void * * * 0x00792cd0) line 1090 + 21 bytes main(int 3, char * * 0x00793ba8) line 1078 + 23 bytes PHP! mainCRTStartup + 227 bytes KERNEL32! 77e81af6()