Remove UndefinedArrayVariable as it is a breaking change

Author: sirbrillig

README.md

@@ -5,7 +5,6 @@
 Plugin for PHP_CodeSniffer static analysis tool that adds analysis of problematic variable use.
 
 - Warns if variables are used without being defined. (Sniff code: `VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable`)
-- Warns if variables are used for an array push shortcut without being defined. (Sniff code: `VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedArrayVariable`)
 - Warns if variables are used inside `unset()` without being defined. (Sniff code: `VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedUnsetVariable`)
 - Warns if variables are set or declared but never used. (Sniff code: `VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable`)
 - Warns if `$this`, `self::$static_member`, `static::$static_member` is used outside class scope. (Sniff codes: `VariableAnalysis.CodeAnalysis.VariableAnalysis.SelfOutsideClass` or `VariableAnalysis.CodeAnalysis.VariableAnalysis.StaticOutsideClass`)

Tests/VariableAnalysisSniff/ArrayAssignmentShortcutTest.php

@@ -25,8 +25,8 @@ public function testArrayAssignmentHasCorrectSniffCodes() {
     $phpcsFile->process();
 
     $warnings = $phpcsFile->getWarnings();
-    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedArrayVariable', $warnings[21][5][0]['source']);
-    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedArrayVariable', $warnings[27][5][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[21][5][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[27][5][0]['source']);
     $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable', $warnings[28][5][0]['source']);
     $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[29][10][0]['source']);
   }

VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php

@@ -1743,7 +1743,7 @@ protected function warnAboutUndefinedArrayPushShortcut(File $phpcsFile, $varName
       $phpcsFile->addWarning(
         "Array variable %s is undefined.",
         $stackPtr,
-        'UndefinedArrayVariable',
+        'UndefinedVariable',
         ["\${$varName}"]
       );
   }