GlobalVarConfig.php

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<?php
class GlobalVarConfig implements Config {
 
    private $prefix;
 
    public static function newInstance() {
        return new GlobalVarConfig();
    }
 
    public function __construct( $prefix = 'wg' ) {
        $this->prefix = $prefix;
    }
 
    public function get( $name ) {
        if ( !$this->has( $name ) ) {
            throw new ConfigException( __METHOD__ . ": undefined option: '$name'" );
        }
        return $this->getWithPrefix( $this->prefix, $name );
    }
 
    public function has( $name ) {
        return $this->hasWithPrefix( $this->prefix, $name );
    }
 
    protected function getWithPrefix( $prefix, $name ) {
        return $GLOBALS[$prefix . $name];
    }
 
    protected function hasWithPrefix( $prefix, $name ) {
        $var = $prefix . $name;
        // (T317951) Don't call array_key_exists unless we have to, as it's slow
        // on PHP 8.1+ for $GLOBALS. When the key is set but is explicitly set
        // to null, we still need to fall back to array_key_exists, but that's
        // rarer.
        return isset( $GLOBALS[$var] ) || array_key_exists( $var, $GLOBALS );
    }
}