add test case for shell_exec() with $result_code set

Author: l-pt

ext/standard/tests/misc/shell_exec_variation.phpt

@@ -0,0 +1,27 @@
+--TEST--
+shell_exec() with exit code setting
+--SKIPIF--
+<?php
+if (!is_executable("/bin/true")) echo "skip";
+if (!function_exists("shell_exec")) echo "skip shell_exec() is not available";
+?>
+--FILE--
+<?php
+$retcode = null;
+
+$commands = [
+	"/bin/true",
+	"non-existent-command > /dev/null 2>&1"
+];
+
+foreach ($commands as $command) {
+	shell_exec($command, $retcode);
+	var_dump($retcode);
+}
+
+echo "Done\n";
+?>
+--EXPECT--
+int(0)
+int(127)
+Done