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PHP_CodeSniffer requires PHP version 5.4.0 or greater, although individual sniffs may have additional requirements such as external applications and scripts. See the [Configuration Options](https://github.com/PHPCSStandards/PHP_CodeSniffer/wiki/Configuration-Options) manual page for a list of these requirements.
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PHP_CodeSniffer 4.x requires PHP 7.2.0 or greater.
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_Prior to PHP_CodeSniffer 4.0.0, the minimum PHP requirement was 5.4.0._
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Additionally, PHP_CodeSniffer requires the following PHP extensions to be enabled:
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- Tokenizer: used by the core tokenizer to process PHP files
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- SimpleXML: used to process ruleset XML files
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- XMLWriter: used to create some report formats
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Individual sniffs may have additional requirements such as external applications and scripts. See the [Configuration Options](https://github.com/PHPCSStandards/PHP_CodeSniffer/wiki/Configuration-Options) manual page for a list of these requirements.
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