CodeCleanerGlobalsPass.php

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<?php
class CodeCleanerGlobalsPass extends \Psy\CodeCleaner\CodeCleanerPass {
    private static $superglobals = [
        'GLOBALS', '_SERVER', '_ENV', '_FILES', '_COOKIE', '_POST', '_GET', '_SESSION'
    ];
 
    public function beforeTraverse( array $nodes ) {
        $globalVars = array_diff( array_keys( $GLOBALS ), self::$superglobals );
        $validGlobalVars = array_filter( $globalVars, static function ( string $name ) {
            // https://www.php.net/manual/en/language.variables.basics.php
            return preg_match( '/^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$/', $name );
        } );
 
        if ( $validGlobalVars ) {
            $globalCommand = new \PhpParser\Node\Stmt\Global_( array_map( static function ( string $name ) {
                return new \PhpParser\Node\Expr\Variable( $name );
            }, $validGlobalVars ) );
            array_unshift( $nodes, $globalCommand );
        }
 
        return $nodes;
    }
}