clean install

vendor/slevomat/coding-standard/doc/variables.md

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+## Variables
+
+#### SlevomatCodingStandard.Variables.DisallowSuperGlobalVariable
+
+Disallows use of super global variables.
+
+#### SlevomatCodingStandard.Variables.DisallowVariableVariable
+
+Disallows use of variable variables.
+
+#### SlevomatCodingStandard.Variables.DuplicateAssignmentToVariable
+
+Looks for duplicate assignments to a variable.
+
+#### SlevomatCodingStandard.Variables.UnusedVariable
+
+Looks for unused variables.
+
+Sniff provides the following settings:
+
+* `ignoreUnusedValuesWhenOnlyKeysAreUsedInForeach` (defaults to `false`): ignore unused `$value` in foreach when only `$key` is used
+
+```php
+foreach ($values as $key => $value) {
+	echo $key;
+}
+```
+
+#### SlevomatCodingStandard.Variables.UselessVariable 🔧
+
+Looks for useless variables.