diff --git a/src/ProcessUtil.php b/src/ProcessUtil.php
new file mode 100644
index 0000000..c7cb5d9
--- /dev/null
+++ b/src/ProcessUtil.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Talmp\Phputils;
+
+class ProcessUtil
+{
+    public static function killTree(int $pid): void
+    {
+        $pstree_output = exec("pstree -p -A $pid");
+
+        // php(2065)---sh(2069)---php7.3(2070)
+        // will matches [2065, 2069, 2070]
+        preg_match_all('/(?<=\()\d+(?=\)(?=-|$))/', $pstree_output, $matches);
+
+        foreach ($matches[0] as $match) {
+            posix_kill($match, SIGKILL);
+        }
+    }
+}
diff --git a/tests/ProcessUtilTest.php b/tests/ProcessUtilTest.php
new file mode 100644
index 0000000..4633789
--- /dev/null
+++ b/tests/ProcessUtilTest.php
@@ -0,0 +1,45 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use Talmp\Phputils\ProcessUtil;
+
+class ProcessUtilTest extends TestCase
+{
+    public function test_kill_tree(): void
+    {
+        $process = proc_open(
+            'php -r "exec(\'sleep 60\');"',
+            [STDIN, STDOUT, STDOUT],
+            $pipes
+        );
+
+        $process_status = proc_get_status($process);
+
+        $this->assertTrue(file_exists('/proc/'.$process_status['pid']));
+
+        exec('kill -0 '.$process_status['pid'], $output, $exit_code);
+
+        $this->assertEquals(0, $exit_code);
+
+        $this->assertNotFalse(posix_getpgid($process_status['pid']));
+
+        $time_start = time();
+
+        ProcessUtil::killTree($process_status['pid']);
+
+        while (true) {
+            $process_status = proc_get_status($process);
+
+            if ($process_status['running'] === false) {
+                break;
+            }
+        }
+
+        $this->assertFalse($process_status['running']);
+        $this->assertEquals(-1, $process_status['exitcode']);
+
+        $time_end = time();
+
+        $this->assertTrue($time_end - $time_start < 60);
+    }
+}