Fixed bug #27731 (error_reporting() inside @ block fails to set

error_reporting level).

Zend/tests/bug27731.phpt

@@ -0,0 +1,10 @@
+--TEST--
+Bug #27731 (error_reporing() call inside @ block does not work correctly)
+--FILE--
+<?php
+	error_reporting(E_ALL ^ E_NOTICE);
+	@error_reporting(0);
+	var_dump(error_reporting());
+?>
+--EXPECT--
+int(0)

Zend/zend_execute.c

@@ -4092,11 +4092,13 @@ int zend_end_silence_handler(ZEND_OPCODE_HANDLER_ARGS)
 {
 	zval restored_error_reporting;
 	
-	restored_error_reporting.type = IS_LONG;
-	restored_error_reporting.value.lval = EX_T(opline->op1.u.var).tmp_var.value.lval;
-	convert_to_string(&restored_error_reporting);
-	zend_alter_ini_entry("error_reporting", sizeof("error_reporting"), Z_STRVAL(restored_error_reporting), Z_STRLEN(restored_error_reporting), ZEND_INI_USER, ZEND_INI_STAGE_RUNTIME);
-	zendi_zval_dtor(restored_error_reporting);
+	if (EG(error_reporting)) {
+		restored_error_reporting.type = IS_LONG;
+		restored_error_reporting.value.lval = EX_T(opline->op1.u.var).tmp_var.value.lval;
+		convert_to_string(&restored_error_reporting);
+		zend_alter_ini_entry("error_reporting", sizeof("error_reporting"), Z_STRVAL(restored_error_reporting), Z_STRLEN(restored_error_reporting), ZEND_INI_USER, ZEND_INI_STAGE_RUNTIME);
+		zendi_zval_dtor(restored_error_reporting);
+	}
 	NEXT_OPCODE();
 }