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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` (default: `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.