diff --git a/Proton/Sniffs/CodingStandard/ForbiddenNamespacedFunctionsSniff.php b/Proton/Sniffs/CodingStandard/ForbiddenNamespacedFunctionsSniff.php
new file mode 100644
index 0000000..8169578
--- /dev/null
+++ b/Proton/Sniffs/CodingStandard/ForbiddenNamespacedFunctionsSniff.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Proton\Sniffs\CodingStandard;
+
+use PHP_CodeSniffer\Standards\Generic\Sniffs\PHP\ForbiddenFunctionsSniff;
+use SlevomatCodingStandard\Helpers\NamespaceHelper;
+
+class ForbiddenNamespacedFunctionsSniff extends ForbiddenFunctionsSniff
+{
+    protected function addError($phpcsFile, $stackPtr, $function, $pattern = null)
+    {
+        $fqfn = NamespaceHelper::resolveName($phpcsFile, $function, 'function', $stackPtr);
+        $canonicalName = NamespaceHelper::normalizeToCanonicalName($fqfn);
+
+        $currentNS = NamespaceHelper::findCurrentNamespaceName($phpcsFile, $stackPtr);
+        $canonicalFunction = NamespaceHelper::normalizeToCanonicalName($currentNS . '\\' . $function);
+
+        if ($canonicalName ===  $canonicalFunction) {
+            parent::addError($phpcsFile, $stackPtr, $function, $pattern);
+        }
+    }
+}
diff --git a/composer.json b/composer.json
index 5e046e5..fbe6947 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,8 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "scripts": {
-        "test-print": "phpcs --standard=Proton/ruleset.xml --report=summary tests",
-        "test": "phpcs --standard=Proton/ruleset.xml --report=csv tests | sort -r | cut -f 2,3,4,6 -d ',' > tests/out.csv; diff tests/expected_csv.txt tests/out.csv"
+        "test-print": "phpcs --standard=tests/phpcs.xml --report=summary tests",
+        "test": "phpcs --standard=tests/phpcs.xml --report=csv tests | sort -r | cut -f 2,3,4,6 -d ',' > tests/out.csv; diff tests/expected_csv.txt tests/out.csv"
     },
     "require": {
         "php": "^7.1",
diff --git a/tests/correct/ClassOk.php b/tests/correct/ClassOk.php
index cfb7964..1005803 100644
--- a/tests/correct/ClassOk.php
+++ b/tests/correct/ClassOk.php
@@ -5,6 +5,7 @@
 namespace Proton\Test;
 
 use Proton\Http\Request;
+use function Proton\Support\phpinfo2;
 
 final class ClassOk
 {
@@ -21,6 +22,8 @@ public function __construct(array $config)
         $this->foo = $config + [
             'foo' => 'bar',
         ];
+
+        phpinfo2();
     }
 
     public function ping(Request $request)
diff --git a/tests/expected.txt b/tests/expected.txt
index b6011c2..1783575 100644
--- a/tests/expected.txt
+++ b/tests/expected.txt
@@ -3,11 +3,11 @@ PHP CODE SNIFFER REPORT SUMMARY
 ------------------------------------------------------------------------------------------------
 FILE                                                                            ERRORS  WARNINGS
 ------------------------------------------------------------------------------------------------
-/Users/Username/dev/Proton/php-coding-standard/tests/wrong/Class1.php           30      0
-/Users/Username/dev/Proton/php-coding-standard/tests/wrong/ClassMetrics.php     4       0
+/Users/Username/dev/Proton/php-coding-standard/tests/wrong/Class1.php           31      3
+/Users/Username/dev/Proton/php-coding-standard/tests/wrong/ClassMetrics.php     4       2
 /Users/Username/dev/Proton/php-coding-standard/tests/wrong/file.php             2       0
 ------------------------------------------------------------------------------------------------
-A TOTAL OF 36 ERRORS AND 0 WARNINGS WERE FOUND IN 3 FILES
+A TOTAL OF 37 ERRORS AND 5 WARNINGS WERE FOUND IN 3 FILES
+------------------------------------------------------------------------------------------------
+PHPCBF CAN FIX 29 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
 ------------------------------------------------------------------------------------------------
-PHPCBF CAN FIX 28 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
-------------------------------------------------------------------------------------------------
\ No newline at end of file
diff --git a/tests/expected_csv.txt b/tests/expected_csv.txt
index 15b7fe0..44a269b 100644
--- a/tests/expected_csv.txt
+++ b/tests/expected_csv.txt
@@ -9,26 +9,27 @@ Line,Column,Type,Source
 1,1,error,SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing
 8,1,error, found 1."
 6,18,error,PSR12.Files.FileHeader.SpacingInsideBlock
-40,1,error,PSR2.Files.EndFileNewline.NoneFound
+41,1,error,PSR2.Files.EndFileNewline.NoneFound
 4,1,error, found 2."
+39,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
+38,13,warning,Squiz.PHP.NonExecutableCode.Unreachable
 38,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
-37,13,warning,Squiz.PHP.NonExecutableCode.Unreachable
 37,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
+36,9,error,Generic.PHP.LowerCaseKeyword.Found
+36,9,error,Squiz.ControlStructures.LowercaseDeclaration.FoundUppercase
+36,9,error,Squiz.ControlStructures.ControlSignature.SpaceAfterKeyword
+36,12,error,Squiz.NamingConventions.ValidVariableName.NotCamelCaps
 36,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
-35,9,error,Generic.PHP.LowerCaseKeyword.Found
-35,9,error,Squiz.ControlStructures.LowercaseDeclaration.FoundUppercase
-35,9,error,Squiz.ControlStructures.ControlSignature.SpaceAfterKeyword
-35,12,error,Squiz.NamingConventions.ValidVariableName.NotCamelCaps
-35,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
-33,9,error,Squiz.NamingConventions.ValidVariableName.NotCamelCaps
-33,24,warning,Generic.CodeAnalysis.EmptyPHPStatement.SemicolonWithoutCodeDetected
-33,24,error,SlevomatCodingStandard.PHP.UselessSemicolon.UselessSemicolon
-33,24,error,Generic.Formatting.DisallowMultipleStatements.SameLine
-33,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
-31,31,error,Squiz.Functions.MultiLineFunctionDeclaration.BraceOnSameLine
-31,13,error,SlevomatCodingStandard.Classes.UnusedPrivateElements.UnusedMethod
-27,27,error,PSR12.Classes.AnonClassDeclaration.SpaceAfterKeyword
-24,13,error,SlevomatCodingStandard.Arrays.TrailingArrayComma.MissingTrailingComma
+34,9,error,Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+34,24,warning,Generic.CodeAnalysis.EmptyPHPStatement.SemicolonWithoutCodeDetected
+34,24,error,SlevomatCodingStandard.PHP.UselessSemicolon.UselessSemicolon
+34,24,error,Generic.Formatting.DisallowMultipleStatements.SameLine
+34,1,error,Generic.WhiteSpace.DisallowTabIndent.TabsUsed
+32,31,error,Squiz.Functions.MultiLineFunctionDeclaration.BraceOnSameLine
+32,13,error,SlevomatCodingStandard.Classes.UnusedPrivateElements.UnusedMethod
+28,27,error,PSR12.Classes.AnonClassDeclaration.SpaceAfterKeyword
+25,13,error,SlevomatCodingStandard.Arrays.TrailingArrayComma.MissingTrailingComma
+22,9,error,Proton.CodingStandard.ForbiddenNamespacedFunctions.FoundWithAlternative
 20,19,error,Generic.PHP.BacktickOperator.Found
 20,14,error,Generic.PHP.BacktickOperator.Found
 16,5,error,PSR12.Traits.UseDeclaration.UseAfterBrace
diff --git a/tests/phpcs.xml b/tests/phpcs.xml
new file mode 100644
index 0000000..c4d71f8
--- /dev/null
+++ b/tests/phpcs.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0"?>
+<ruleset name="ProtonLabs PHP CodeSniffer Standard">
+    <description>
+        Proton PHP Coding Standard
+    </description>
+
+    <config name="installed_paths" value="../Proton"/>
+
+    <rule ref="Proton"/>
+
+    <rule ref="Proton.CodingStandard.ForbiddenNamespacedFunctions">
+        <properties>
+            <property name="forbiddenFunctions" type="array">
+                <element key="phpinfo2" value="\Proton\Support\phpinfo2"/>
+            </property>
+        </properties>
+    </rule>
+</ruleset>
diff --git a/tests/wrong/Class1.php b/tests/wrong/Class1.php
index c9d7d5b..4364d36 100644
--- a/tests/wrong/Class1.php
+++ b/tests/wrong/Class1.php
@@ -19,6 +19,7 @@ public function __construct()
     {
         echo `test`;
 
+        phpinfo2();
 
         print_r([
             1