Restore zend_atoi()

I dropped this in preparation for changes that I didn't end up
doing. Restore the function for now to avoid unnecessary churn for
extensions.

Author: nikic

UPGRADING.INTERNALS

@@ -44,9 +44,6 @@ PHP 8.1 INTERNALS UPGRADE NOTES
      implementations. Use ZEND_LONG_FMT and ZEND_ULONG_FMT instead.
   e. ZEND_ATOL() now returns the integer instead of assigning it as part of the
      macro. Replace ZEND_ATOL(i, s) with i = ZEND_ATOL(s).
-  f. zend_atoi() has been removed. It is identical to (int) zend_atol(). Please
-     note that zend_atol() parses an integer with size suffix. If you just want
-     to parse a simple integer use ZEND_ATOL() or ZEND_STRTOL().
 
 ========================
 2. Build system changes

Zend/zend_operators.c

@@ -123,6 +123,11 @@ ZEND_API zend_long ZEND_FASTCALL zend_atol(const char *str, size_t str_len) /* {
 }
 /* }}} */
 
+ZEND_API int ZEND_FASTCALL zend_atoi(const char *str, size_t str_len)
+{
+	return (int) zend_atol(str, str_len);
+}
+
 /* {{{ convert_object_to_type: dst will be either ctype or UNDEF */
 #define convert_object_to_type(op, dst, ctype)									\
 	ZVAL_UNDEF(dst);																		\

Zend/zend_operators.h

@@ -458,6 +458,7 @@ ZEND_API int ZEND_FASTCALL zend_compare_symbol_tables(HashTable *ht1, HashTable
 ZEND_API int ZEND_FASTCALL zend_compare_arrays(zval *a1, zval *a2);
 ZEND_API int ZEND_FASTCALL zend_compare_objects(zval *o1, zval *o2);
 
+ZEND_API int ZEND_FASTCALL zend_atoi(const char *str, size_t str_len);
 ZEND_API zend_long ZEND_FASTCALL zend_atol(const char *str, size_t str_len);
 
 #define convert_to_null_ex(zv) convert_to_null(zv)

ext/zlib/zlib.c

@@ -1278,7 +1278,7 @@ static PHP_INI_MH(OnUpdate_zlib_output_compression)
 	} else if (zend_string_equals_literal_ci(new_value, "on")) {
 		int_value = 1;
 	} else {
-		int_value = (int) zend_atol(ZSTR_VAL(new_value), ZSTR_LEN(new_value));
+		int_value = zend_atoi(ZSTR_VAL(new_value), ZSTR_LEN(new_value));
 	}
 	ini_value = zend_ini_string("output_handler", sizeof("output_handler"), 0);