Add test for escapeshellcmd and restore previous behaviour with stripping % on Windows.

ext/standard/exec.c

@@ -284,6 +284,11 @@ PHPAPI char *php_escape_shell_cmd(char *str)
 				}
 				cmd[y++] = str[x];
 				break;
+#else
+			/* This is Windows specific for enviromental variables */
+			case '%':
+				cmd[y++] = '';
+				break;
 #endif
 			case '#': /* This is character-set independent */
 			case '&':
@@ -307,8 +312,6 @@ PHPAPI char *php_escape_shell_cmd(char *str)
 			case '\x0A': /* excluding these two */
 			case '\xFF':
 #ifdef PHP_WIN32
-			/* This is Windows specific for enviromental variables */
-			case '%':
 				cmd[y++] = '^';
 #else
 				cmd[y++] = '\\';

ext/standard/tests/general_functions/escapeshellcmd-win32.phpt

@@ -0,0 +1,46 @@
+--TEST--
+Test escapeshellcmd() functionality on Windows
+--SKIPIF--
+<?php
+if( substr(PHP_OS, 0, 3) != 'WIN' ) {
+   die('skip...Valid for Windows only');
+}
+?>
+--FILE--
+<?php
+echo "*** Testing escapeshellcmd() basic operations ***\n";
+$data = array(
+	'"abc',
+	"'abc",
+	'?<>',
+	'()[]{}$',
+	'%^',
+	'#&;`|*?',
+	'~<>\\'
+);
+
+$count = 1;
+foreach ($data AS $value) {
+	echo "-- Test " . $count++ . " --\n";
+	var_dump(escapeshellcmd($value));
+}
+
+echo "Done\n";
+?>
+--EXPECTF--
+*** Testing escapeshellcmd() basic operations ***
+-- Test 1 --
+string(5) "^"abc"
+-- Test 2 --
+string(5) "^'abc"
+-- Test 3 --
+string(6) "^?^<^>"
+-- Test 4 --
+string(14) "^(^)^[^]^{^}^$"
+-- Test 5 --
+string(2) "^^"
+-- Test 6 --
+string(14) "^#^&^;^`^|^*^?"
+-- Test 7 --
+string(8) "^~^<^>^\"
+Done