Promote warning to exception in ldap_set_rebind_proc()

From now on, ldap_set_rebind_proc() will only accept callable or null
as argument 2.

Closes GH-5763

Author: ptomulik

UPGRADING

@@ -275,6 +275,8 @@ PHP 8.0 UPGRADE NOTES
 
 - LDAP:
   . The deprecated function ldap_sort has been removed.
+  . The interface of ldap_set_rebind_proc has changed; the $callback parameter
+    does not accept empty string anymore; null value shall be used instead.
 
 - Mbstring:
   . The mbstring.func_overload directive has been removed. The related

ext/ldap/ldap.c

@@ -3736,7 +3736,7 @@ int _ldap_rebind_proc(LDAP *ldap, const char *url, ber_tag_t req, ber_int_t msgi
 }
 /* }}} */
 
-/* {{{ proto bool ldap_set_rebind_proc(resource link, string callback)
+/* {{{ proto bool ldap_set_rebind_proc(resource link, ?callable callback)
    Set a callback function to do re-binds on referral chasing. */
 PHP_FUNCTION(ldap_set_rebind_proc)
 {
@@ -3751,7 +3751,7 @@ PHP_FUNCTION(ldap_set_rebind_proc)
 		RETURN_THROWS();
 	}
 
-	if (Z_TYPE_P(callback) == IS_STRING && Z_STRLEN_P(callback) == 0) {
+	if (Z_TYPE_P(callback) == IS_NULL) {
 		/* unregister rebind procedure */
 		if (!Z_ISUNDEF(ld->rebindproc)) {
 			zval_ptr_dtor(&ld->rebindproc);
@@ -3763,10 +3763,8 @@ PHP_FUNCTION(ldap_set_rebind_proc)
 
 	/* callable? */
 	if (!zend_is_callable(callback, 0, NULL)) {
-		zend_string *callback_name = zend_get_callable_name(callback);
-		php_error_docref(NULL, E_WARNING, "Two arguments expected for '%s' to be a valid callback", ZSTR_VAL(callback_name));
-		zend_string_release_ex(callback_name, 0);
-		RETURN_FALSE;
+		zend_argument_type_error(2, "must be a valid callback or null, %s given", zend_zval_type_name(callback));
+		RETURN_THROWS();
 	}
 
 	/* register rebind procedure */

ext/ldap/ldap.stub.php

@@ -260,9 +260,8 @@ function ldap_parse_result($link, $result, &$errcode, &$matcheddn = null, &$errm
 #if defined(LDAP_API_FEATURE_X_OPENLDAP) && defined(HAVE_3ARG_SETREBINDPROC)
 /**
  * @param resource $link
- * @param callable $callback
  */
-function ldap_set_rebind_proc($link, $callback): bool {}
+function ldap_set_rebind_proc($link, ?callable $callback): bool {}
 #endif
 
 #ifdef HAVE_LDAP_START_TLS_S

ext/ldap/ldap_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 53051e130a22dc519676c7a91529d2f9f7d1e6ad */
+ * Stub hash: c9ce0e98ab386130b6332ae017808bec67b1cd07 */
 
 #if defined(HAVE_ORALDAP)
 ZEND_BEGIN_ARG_INFO_EX(arginfo_ldap_connect, 0, 0, 0)
@@ -280,7 +280,7 @@ ZEND_END_ARG_INFO()
 #if defined(LDAP_API_FEATURE_X_OPENLDAP) && defined(HAVE_3ARG_SETREBINDPROC)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_ldap_set_rebind_proc, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_INFO(0, link)
-	ZEND_ARG_INFO(0, callback)
+	ZEND_ARG_TYPE_INFO(0, callback, IS_CALLABLE, 1)
 ZEND_END_ARG_INFO()
 #endif
 

ext/ldap/tests/ldap_set_rebind_proc_basic.phpt

@@ -25,7 +25,7 @@ function rebind_proc ($ds, $ldap_url) {
 
 $link = ldap_connect_and_bind($host, $port, $user, $passwd, $protocol_version);
 var_dump(ldap_set_rebind_proc($link, "rebind_proc"));
-var_dump(ldap_set_rebind_proc($link, ""));
+var_dump(ldap_set_rebind_proc($link, null));
 ?>
 --EXPECT--
 bool(true)

ext/ldap/tests/ldap_set_rebind_proc_error.phpt

@@ -33,8 +33,11 @@ function rebind_proc ($ds, $ldap_url) {
 }
 
 $link = ldap_connect($host, $port);
-var_dump(ldap_set_rebind_proc($link, "rebind_proc_inexistent"));
+try {
+    $result = ldap_set_rebind_proc($link, "rebind_proc_inexistent");
+} catch(\TypeError $error) {
+    echo $error->getMessage(), "\n";
+}
 ?>
 --EXPECTF--
-Warning: ldap_set_rebind_proc(): Two arguments expected for 'rebind_proc_inexistent' to be a valid callback in %s on line %d
-bool(false)
+ldap_set_rebind_proc(): Argument #2 ($callback) must be a valid callback or null, string given