getConfiguration.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class GetConfiguration extends Maintenance {

    protected $regex = null;

    protected $settings_list = [];

    protected static $outFormats = [
        'json',
        'php',
        'serialize',
        'vardump',
    ];

    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Get serialized MediaWiki site configuration' );
        $this->addOption( 'regex', 'regex to filter variables with', false, true );
        $this->addOption( 'iregex', 'same as --regex but case insensitive', false, true );
        $this->addOption( 'settings', 'Space-separated list of wg* variables', false, true );
        $this->addOption( 'format', implode( ', ', self::$outFormats ), false, true );
    }

    protected function validateParamsAndArgs() {
        $error_out = false;

        # Get the format and make sure it is set to a valid default value
        $format = strtolower( $this->getOption( 'format', 'PHP' ) );

        $validFormat = in_array( $format, self::$outFormats );
        if ( !$validFormat ) {
            $this->error( "--format set to an unrecognized format", 0 );
            $error_out = true;
        }

        if ( $this->getOption( 'regex' ) && $this->getOption( 'iregex' ) ) {
            $this->error( "Can only use either --regex or --iregex" );
            $error_out = true;
        }

        parent::validateParamsAndArgs();

        if ( $error_out ) {
            # Force help and quit
            $this->maybeHelp( true );
        }
    }

    public function finalSetup() {
        parent::finalSetup();

        $this->regex = $this->getOption( 'regex' ) ?: $this->getOption( 'iregex' );
        if ( $this->regex ) {
            $this->regex = '/' . $this->regex . '/';
            if ( $this->hasOption( 'iregex' ) ) {
                $this->regex .= 'i'; # case insensitive regex
            }
        }

        if ( $this->hasOption( 'settings' ) ) {
            $this->settings_list = explode( ' ', $this->getOption( 'settings' ) );
            # Values validation
            foreach ( $this->settings_list as $name ) {
                if ( !preg_match( '/^wg[A-Z]/', $name ) ) {
                    throw new MWException( "Variable '$name' does start with 'wg'." );
                } elseif ( !isset( $GLOBALS[$name] ) ) {
                    throw new MWException( "Variable '$name' is not set." );
                } elseif ( !$this->isAllowedVariable( $GLOBALS[$name] ) ) {
                    throw new MWException( "Variable '$name' includes non-array, non-scalar, items." );
                }
            }
        }
    }

    public function execute() {
        // Settings we will display
        $res = [];

        # Sane default: dump any wg / wmg variable
        if ( !$this->regex && !$this->getOption( 'settings' ) ) {
            $this->regex = '/^wm?g/';
        }

        # Filter out globals based on the regex
        if ( $this->regex ) {
            $res = [];
            foreach ( $GLOBALS as $name => $value ) {
                if ( preg_match( $this->regex, $name ) ) {
                    $res[$name] = $value;
                }
            }
        }

        # Explicitly dumps a list of provided global names
        if ( $this->settings_list ) {
            foreach ( $this->settings_list as $name ) {
                $res[$name] = $GLOBALS[$name];
            }
        }

        ksort( $res );

        $out = null;
        switch ( strtolower( $this->getOption( 'format' ) ) ) {
            case 'serialize':
            case 'php':
                $out = serialize( $res );
                break;
            case 'vardump':
                $out = $this->formatVarDump( $res );
                break;
            case 'json':
                $out = FormatJson::encode( $res );
                break;
            default:
                throw new MWException( "Invalid serialization format given." );
        }
        if ( !is_string( $out ) ) {
            throw new MWException( "Failed to serialize the requested settings." );
        }

        if ( $out ) {
            $this->output( $out . "\n" );
        }
    }

    protected function formatVarDump( $res ) {
        $ret = '';
        foreach ( $res as $key => $value ) {
            ob_start(); # intercept var_dump() output
            print "\${$key} = ";
            var_dump( $value );
            # grab var_dump() output and discard it from the output buffer
            $ret .= trim( ob_get_clean() ) . ";\n";
        }

        return trim( $ret, "\n" );
    }

    private function isAllowedVariable( $value ) {
        if ( is_array( $value ) ) {
            foreach ( $value as $k => $v ) {
                if ( !$this->isAllowedVariable( $v ) ) {
                    return false;
                }
            }

            return true;
        } elseif ( is_scalar( $value ) || $value === null ) {
            return true;
        }

        return false;
    }
}

$maintClass = "GetConfiguration";
require_once RUN_MAINTENANCE_IF_MAIN;