I'm trying to run PHP in my own multithreaded environment.
Memory leaks are critical for my application.

I've tried to track the leaks down using memprof and I think
I've found a leak in the initialization of globals in standard regex
extension.

There's original module initialization taken
from PHP 4.2.1 sources (ext/standard/reg.c):

PHP_MINIT_FUNCTION(regex)
{
#ifdef ZTS
	ts_allocate_id(&reg_globals_id,
         sizeof(php_reg_globals),
        (ts_allocate_ctor) php_reg_init_globals, NULL);
#else
     	php_reg_init_globals(&reg_globals TSRMLS_CC);
#endif

      	return SUCCESS;
}

There's no destructor routine registered for the globals for thread-safe version of PHP.

I've tried to correct it writing destructor routine, there's the modified source:

static void php_reg_destroy_globals(php_reg_globals *reg_globals TSRMLS_DC)
{
 	zend_hash_destroy(&reg_globals->ht_rc);
}

PHP_MINIT_FUNCTION(regex)
{
#ifdef ZTS
        ts_allocate_id(&reg_globals_id,     sizeof(php_reg_globals),
                (ts_allocate_ctor) php_reg_init_globals,
                (ts_allocate_dtor) php_reg_destroy_globals);
#else
        php_reg_init_globals(&reg_globals TSRMLS_CC);
#endif
}

I'm not sure if my modification is clean, but it seems to solve the leak problem.