ezmlm_hash() function also available for php4.

ext/standard/basic_functions.c

@@ -455,6 +455,7 @@ function_entry basic_functions[] = {
 
 	/* functions from mail.c */
 	PHP_FE(mail,					NULL)
+	PHP_FE(ezmlm_hash,				NULL)
 
 	/* functions from syslog.c */
 	PHP_FE(openlog,					NULL)

ext/standard/mail.c

@@ -38,6 +38,37 @@
 ZEND_GET_MODULE(odbc)
 #endif
 
+/* {{{ proto int ezmlm_hash(string addr)
+   Calculate EZMLM list hash value. */
+PHP_FUNCTION(ezmlm_hash)
+{
+	pval **pstr = NULL;
+	char *str=NULL;
+	unsigned long h = 5381L;
+	int j, l;
+	
+	if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(1, &pstr) == FAILURE) {
+		WRONG_PARAM_COUNT;
+	}
+
+	convert_to_string_ex(pstr);
+	if ((*pstr)->value.str.val) {
+		str = (*pstr)->value.str.val;
+	} else {
+		php_error(E_WARNING, "Must give string parameter to ezmlm_hash()");
+		RETURN_FALSE;
+	}
+	
+	l = strlen(str);
+	for (j=0; j<l; j++) {
+		h = (h + (h<<5)) ^ (unsigned long) (unsigned char) tolower(str[j]);
+	}
+	
+	h = (h%53);
+	
+	RETURN_LONG((int) h);
+}
+
 /* {{{ proto int mail(string to, string subject, string message [, string additional_headers])
    Send an email message */
 PHP_FUNCTION(mail)

ext/standard/php_mail.h

@@ -36,6 +36,7 @@
 #if HAVE_SENDMAIL
 
 PHP_FUNCTION(mail);
+PHP_FUNCTION(ezmlm_hash);
 PHP_MINFO_FUNCTION(mail);
 extern int php_mail(char *to, char *subject, char *message, char *headers);