diff --git a/composer.json b/composer.json
index 5fc87aee..d208389b 100644
--- a/composer.json
+++ b/composer.json
@@ -72,7 +72,10 @@
     ],
     "config": {
         "optimize-autoloader": true,
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
     },
     "extra": {
         "hooks": {
diff --git a/src/ZM/global_functions.php b/src/ZM/global_functions.php
index ac223c53..6253de9f 100644
--- a/src/ZM/global_functions.php
+++ b/src/ZM/global_functions.php
@@ -156,16 +156,16 @@ function match_args(string $pattern, string $subject)
         $exp = explode('*', $pattern);
         $i = 0;
         foreach ($exp as $k => $v) {
-            if (empty($v) && $k === 0) {
+            if ($v === '' && $k === 0) {
                 continue;
             }
-            if (empty($v) && $k === count($exp) - 1) {
+            if ($v === '' && $k === count($exp) - 1) {
                 $subject .= '^EOL';
                 $v = '^EOL';
             }
             $cur_var = '';
             $ori = $i;
-            while (($a = mb_substr($subject, $i, mb_strlen($v))) !== $v && !empty($a)) {
+            while (($a = mb_substr($subject, $i, mb_strlen($v))) !== $v && $a !== '') {
                 $cur_var .= mb_substr($subject, $i, 1);
                 ++$i;
             }