Deprecate terminating case statements with semicolon

Part of https://wiki.php.net/rfc/deprecations_php_8_5

Closes GH-15258

Author: theodorejb

Zend/zend_compile.c

@@ -6303,6 +6303,11 @@ static void zend_compile_switch(zend_ast *ast) /* {{{ */
 			continue;
 		}
 
+		if (case_ast->attr == ZEND_ALT_CASE_SYNTAX) {
+			CG(zend_lineno) = case_ast->lineno;
+			zend_error(E_DEPRECATED, "Case statements followed by a semicolon (;) are deprecated, use a colon (:) instead");
+		}
+
 		zend_compile_expr(&cond_node, cond_ast);
 
 		if (expr_node.op_type == IS_CONST

Zend/zend_compile.h

@@ -1126,6 +1126,7 @@ ZEND_API zend_string *zend_type_to_string(zend_type type);
 	((ZEND_TYPE_FULL_MASK((arg_info)->type) & _ZEND_IS_TENTATIVE_BIT) != 0)
 
 #define ZEND_DIM_IS					(1 << 0) /* isset fetch needed for null coalesce. Set in zend_compile.c for ZEND_AST_DIM nested within ZEND_AST_COALESCE. */
+#define ZEND_ALT_CASE_SYNTAX		(1 << 1) /* deprecated switch case terminated by semicolon */
 
 /* Attributes for ${} encaps var in strings (ZEND_AST_DIM or ZEND_AST_VAR node) */
 /* ZEND_AST_VAR nodes can have any of the ZEND_ENCAPS_VAR_* flags */

Zend/zend_language_parser.y

@@ -713,15 +713,14 @@ switch_case_list:
 
 case_list:
 		%empty { $$ = zend_ast_create_list(0, ZEND_AST_SWITCH_LIST); }
-	|	case_list T_CASE expr case_separator inner_statement_list
+	|	case_list T_CASE expr ':' inner_statement_list
 			{ $$ = zend_ast_list_add($1, zend_ast_create(ZEND_AST_SWITCH_CASE, $3, $5)); }
-	|	case_list T_DEFAULT case_separator inner_statement_list
+	|	case_list T_CASE expr ';' inner_statement_list
+			{ $$ = zend_ast_list_add($1, zend_ast_create_ex(ZEND_AST_SWITCH_CASE, ZEND_ALT_CASE_SYNTAX, $3, $5)); }
+	|	case_list T_DEFAULT ':' inner_statement_list
 			{ $$ = zend_ast_list_add($1, zend_ast_create(ZEND_AST_SWITCH_CASE, NULL, $4)); }
-;
-
-case_separator:
-		':'
-	|	';'
+	|	case_list T_DEFAULT ';' inner_statement_list
+			{ $$ = zend_ast_list_add($1, zend_ast_create_ex(ZEND_AST_SWITCH_CASE, ZEND_ALT_CASE_SYNTAX, NULL, $4)); }
 ;
 
 

ext/opcache/tests/issue0057.phpt

@@ -15,9 +15,9 @@ class ZException extends Exception {
 function dummy($query) {
     try {
         switch ($query) {
-            case 1;
+            case 1:
             break;
-            case 2;
+            case 2:
             break;
         default:
             throw new Exception('exception');

tests/lang/033.phpt

@@ -37,7 +37,8 @@ switch ($a):
         break;
 endswitch;
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Case statements followed by a semicolon (;) are deprecated, use a colon (:) instead in %s
 If: 11
 While: 12346789
 For: 0123401234

tests/lang/bug26696.phpt

@@ -15,7 +15,7 @@ for ($i = 0; $i < $len; $i++) {
 
 $str = '*';
 switch ($str[0]) {
-    case '*';
+    case '*':
         echo "OK\n";
         break;
     default: