Generic/UselessOverridingMethod: consider case-insensitivity of method names

Method names in PHP are case insensitive. So this commit changes the sniff
code to flag as potentially useless overrides methods that only call
their parent using a different case.

Author: rodrigoprimo

src/Standards/Generic/Sniffs/CodeAnalysis/UselessOverridingMethodSniff.php

@@ -97,11 +97,11 @@ public function process(File $phpcsFile, $stackPtr)
             return;
         }
 
-        // Find next non empty token index, should be the function name.
+        // Find next non empty token index, should be the parent method name.
         $next = $phpcsFile->findNext(Tokens::$emptyTokens, ($next + 1), null, true);
 
         // Skip for invalid code or other method.
-        if ($next === false || $tokens[$next]['content'] !== $methodName) {
+        if ($next === false || strcasecmp($tokens[$next]['content'], $methodName) !== 0) {
             return;
         }
 

src/Standards/Generic/Tests/CodeAnalysis/UselessOverridingMethodUnitTest.1.inc

@@ -64,6 +64,14 @@ class Bar {
     public function sameNumberDifferentParameters($a, $b) {
         return parent::sameNumberDifferentParameters($this->prop[$a], $this->{$b});
     }
+
+    public function differentCase() {
+        return parent::DIFFERENTcase();
+    }
+
+    public function differentCaseWithNonAnsiiCharacters() {
+        return parent::DIFFERENTcaseWithNonAnsiiCharáctêrs();
+    }
 }
 
 abstract class AbstractFoo {

src/Standards/Generic/Tests/CodeAnalysis/UselessOverridingMethodUnitTest.php

@@ -54,6 +54,7 @@ public function getWarningList($testFile='')
                 16 => 1,
                 38 => 1,
                 56 => 1,
+                68 => 1,
             ];
         default:
             return [];