diff --git a/dev/phpcheckstyle/phpstandard.cfg.xml b/dev/phpcheckstyle/phpstandard.cfg.xml
index 43f0db9519c..164c56a2d63 100644
--- a/dev/phpcheckstyle/phpstandard.cfg.xml
+++ b/dev/phpcheckstyle/phpstandard.cfg.xml
@@ -11,7 +11,7 @@
     -->
     
      <!-- Check Variable Naming -->
-    <test name="variableNaming" regexp="/^[a-z_][a-zA-Z0-9_]*$/" />
+    <test name="variableNaming" regexp="/^[a-zA-Z_][a-zA-Z0-9_]*$/" />
     
     <!-- Check Function Naming -->
     <test name="functionNaming" regexp="/^[a-z_]/" level="WARNING"/>