Implemented touch() function.

builtin-functions/_functions.txt

@@ -1620,3 +1620,6 @@ class DateTimeImmutable implements DateTimeInterface {
 }
 
 function getenv(string $varname = '', bool $local_only = false): mixed;
+
+//2022-05-01 comm644
+function touch($filename ::: string, int $mtime  = 0, int $atime = 0): bool;

runtime/files.cpp

@@ -939,3 +939,4 @@ void free_files_lib() {
   dl::leave_critical_section();
 }
 
+#include "files_touch.cpp"

runtime/files.h

@@ -72,3 +72,5 @@ Optional<string> file_file_get_contents(const string &name);
 void global_init_files_lib();
 
 void free_files_lib();
+
+#include "files_touch.h"

runtime/files_touch.cpp

@@ -0,0 +1,22 @@
+// Compiler for PHP (aka KPHP)
+// Copyright (c) 2023 LLC Sigmalab
+// Distributed under the GPL v3 License, see LICENSE.notice.txt
+#include <ctime>
+#include <sys/types.h>
+#include <utime.h>
+
+bool f$touch(const string filename, const int64_t mtime, const int64_t atime)
+{
+  if (FILE *file = fopen(filename.c_str(), "a+")) {
+     fclose(file);
+  }
+  else {
+    return false;
+  }
+
+  time_t now = std::time(NULL);
+  time_t val_mtime = !mtime ? now : mtime;
+  time_t val_atime = !atime ? now : atime;
+  const utimbuf   timebuf = {val_atime, val_mtime};
+  return utime(filename.c_str(), &timebuf ) == 0;
+}

runtime/files_touch.h

@@ -0,0 +1,9 @@
+// Compiler for PHP (aka KPHP)
+// Copyright (c) 2023 LLC Sigmalab
+// Distributed under the GPL v3 License, see LICENSE.notice.txt
+
+#pragma once
+#include "runtime/kphp_core.h"
+#include <sys/types.h>
+
+bool f$touch(const string filename, const int64_t mtime=0, const int64_t atime=0);