diff --git a/ext/standard/proc_open.c b/ext/standard/proc_open.c
index d78ca9976b825..66d87aec9047e 100644
--- a/ext/standard/proc_open.c
+++ b/ext/standard/proc_open.c
@@ -471,7 +471,7 @@ PHP_FUNCTION(proc_open)
 	php_file_descriptor_t slave_pty = -1;
 #endif
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "saz|s!a!a!", &command,
+	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "saz|s!a/!a!", &command,
 				&command_len, &descriptorspec, &pipes, &cwd, &cwd_len, &environment,
 				&other_options) == FAILURE) {
 		RETURN_FALSE;
diff --git a/ext/standard/tests/streams/bug60602.phpt b/ext/standard/tests/streams/bug60602.phpt
new file mode 100644
index 0000000000000..f0a3cf83e870c
--- /dev/null
+++ b/ext/standard/tests/streams/bug60602.phpt
@@ -0,0 +1,55 @@
+--TEST--
+Bug #60602 proc_open() modifies environment if it contains arrays
+--FILE--
+<?php
+
+$descs = array(
+	0 => array('pipe', 'r'), // stdin
+	1 => array('pipe', 'w'), // stdout
+	2 => array('pipe', 'w'), // strerr
+);
+
+$environment = array('test' => array(1, 2, 3));
+
+$cmd = (substr(PHP_OS, 0, 3) == 'WIN') ? 'dir' : 'ls';
+$p = proc_open($cmd, $descs, $pipes, '.', $environment);
+
+if (is_resource($p)) {
+	$data = '';
+
+	while (1) {	
+		$w = $e = NULL;
+		$n = stream_select($pipes, $w, $e, 300);
+
+		if ($n === false) {
+			echo "no streams \n";
+			break;
+		} else if ($n === 0) {
+			echo "process timed out\n";
+			proc_terminate($p, 9);
+			break;
+		} else if ($n > 0) {
+			$line = fread($pipes[1], 8192);
+			if (strlen($line) == 0) {
+				/* EOF */
+				break;
+			}
+			$data .= $line;
+		}
+	}
+	var_dump(strlen($data));
+
+	$ret = proc_close($p);
+	var_dump($ret);
+	var_dump(is_array($environment['test']));
+} else {
+	echo "no process\n";
+}
+?>
+==DONE==
+--EXPECTF--
+Notice: Array to string conversion in %s on line %d
+int(%d)
+int(0)
+bool(true)
+==DONE==