opcache optimizer: optimize some more functions on compile time

- don't optimize basename(), version_compare(string, string, string)
- optimize strtolower(string), strtoupper()

Author: brainexe

ext/opcache/Optimizer/sccp.c

@@ -844,6 +844,7 @@ static inline int ct_eval_func_call(
 				|| zend_string_equals_literal(name, "urldecode")
 				|| zend_string_equals_literal(name, "rawurlencode")
 				|| zend_string_equals_literal(name, "rawurldecode")
+				|| zend_string_equals_literal(name, "php_uname")
 				|| zend_string_equals_literal(name, "strtoupper")
 				|| zend_string_equals_literal(name, "strtolower")
 				|| zend_string_equals_literal(name, "dirname")
@@ -872,7 +873,7 @@ static inline int ct_eval_func_call(
 			} ZEND_HASH_FOREACH_END();
 			/* pass */
 		} else if (zend_string_equals_literal(name, "implode")
-                || zend_string_equals_literal(name, "array_unique")) {
+				|| zend_string_equals_literal(name, "array_unique")) {
 			zval *entry;
 
 			if (Z_TYPE_P(args[0]) != IS_ARRAY) {
@@ -916,6 +917,11 @@ static inline int ct_eval_func_call(
 					|| (Z_TYPE_P(args[1]) != IS_LONG)) {
 				return FAILURE;
 			}
+			if (Z_LVAL_P(args[1]) < 1) {
+				// levels must be >= 1, else we get a ValueError
+				return FAILURE;
+			}
+
 			/* pass */
 		} else if (zend_string_equals_literal(name, "trim")
 				|| zend_string_equals_literal(name, "rtrim")
@@ -1015,6 +1021,7 @@ static inline int ct_eval_func_call(
 				}
 			}
 			/* pass */
+		// todo: version_compare with 3 arguments got removed, as we should add a proper check for the comperator, else we hide a ValueError
 		} else if (zend_string_equals_literal(name, "str_replace")) {
 			if (Z_TYPE_P(args[0]) != IS_STRING
 					|| Z_TYPE_P(args[1]) != IS_STRING