Added missing consistency check for abstract methods required by one …

…trait and implemented by another.

Zend/tests/traits/bugs/abstract-methods05.phpt

@@ -0,0 +1,25 @@
+--TEST--
+The compatibility with the signature of abstract methods should be checked.
+--FILE--
+<?php
+error_reporting(E_ALL);
+
+trait THelloB {
+  public function hello() {
+	echo 'Hello';
+  }
+}
+
+trait THelloA {
+  public abstract function hello($a);
+}
+
+class TraitsTest1 {
+	use THelloB;
+	use THelloA;  
+}
+
+
+?>
+--EXPECTF--	
+Fatal error: Declaration of THelloB::hello() must be compatible with THelloA::hello($a) in %s on line %d

Zend/tests/traits/bugs/abstract-methods06.phpt

@@ -0,0 +1,26 @@
+--TEST--
+The compatibility with the signature of abstract methods should be checked. (also checking the second possible implementation branch)
+--FILE--
+<?php
+error_reporting(E_ALL);
+
+trait THelloB {
+  public function hello() {
+    echo 'Hello';
+  }  
+}
+
+trait THelloA {
+  public abstract function hello($a);
+}
+
+class TraitsTest1 {
+	use THelloA;
+	use THelloB;
+}
+
+
+
+?>
+--EXPECTF--	
+Fatal error: Declaration of THelloB::hello() must be compatible with THelloA::hello($a) in %s on line %d

Zend/zend_compile.c

@@ -3616,13 +3616,19 @@ static int zend_traits_merge_functions(zend_function *fn TSRMLS_DC, int num_args
 		if (zend_hash_quick_find(function_tables[i], hash_key->arKey, hash_key->nKeyLength, hash_key->h, (void **)&other_trait_fn) == SUCCESS) {
 			/* if it is an abstract method, there is no collision */
 			if (other_trait_fn->common.fn_flags & ZEND_ACC_ABSTRACT) {
+				/* Make sure they are compatible */
+				do_inheritance_check_on_method(fn, other_trait_fn TSRMLS_CC);
+
 				/* we can savely free and remove it from other table */
 				zend_function_dtor(other_trait_fn);
 				zend_hash_quick_del(function_tables[i], hash_key->arKey, hash_key->nKeyLength, hash_key->h);
 			} else {
 				/* if it is not an abstract method, there is still no collision */
 				/* if fn is an abstract method */
 				if (fn->common.fn_flags & ZEND_ACC_ABSTRACT) {
+					/* Make sure they are compatible */
+					do_inheritance_check_on_method(other_trait_fn, fn TSRMLS_CC);
+
 					/* just mark as solved, will be added if its own trait is processed */
 					abstract_solved = 1;
 				} else {