GlobalVarConfig.php

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<?php
namespace MediaWiki\Config;
 
use function array_key_exists;
 
class GlobalVarConfig implements Config {
 
    private $prefix;
 
    public static function newInstance() {
        return new self();
    }
 
    public function __construct( $prefix = 'wg' ) {
        $this->prefix = $prefix;
    }
 
    public function get( $name ) {
        $var = $this->prefix . $name;
 
        // Fast path combines check and retrieval.
        $value = $GLOBALS[$var] ?? null;
        if ( $value !== null ) {
            return $value;
        }
 
        // Slow path: the value is either explicitly null or missing.
        // We have to pay the price of array_key_exists() here to distinguish the two.
        if ( array_key_exists( $var, $GLOBALS ) ) {
            return null;
        }
 
        throw new ConfigException( __METHOD__ . ": undefined option: '$name'" );
    }
 
    public function has( $name ) {
        $var = $this->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 );
    }
}
 
class_alias( GlobalVarConfig::class, 'GlobalVarConfig' );