NoLocalSettings.php

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<?php
# T32219 : can not use pathinfo() on URLs since slashes do not match
$matches = [];
$path = '/';
foreach ( array_filter( explode( '/', $_SERVER['PHP_SELF'] ) ) as $part ) {
    if ( !preg_match( '/\.(php)$/', $part, $matches ) ) {
        $path .= "$part/";
    } else {
        break;
    }
}
 
# Check to see if the installer is running
if ( !function_exists( 'session_name' ) ) {
    $installerStarted = false;
} else {
    if ( !wfIniGetBool( 'session.auto_start' ) ) {
        session_name( 'mw_installer_session' );
    }
    $oldReporting = error_reporting( E_ALL & ~E_NOTICE );
    $success = session_start();
    error_reporting( $oldReporting );
    $installerStarted = ( $success && isset( $_SESSION['installData'] ) );
}
 
$templateParser = new TemplateParser();
 
# Render error page if no LocalSettings file can be found
try {
    global $wgVersion;
    echo $templateParser->processTemplate(
        'NoLocalSettings',
        [
            'wgVersion' => ( $wgVersion ?? 'VERSION' ),
            'path' => $path,
            'localSettingsExists' => file_exists( MW_CONFIG_FILE ),
            'installerStarted' => $installerStarted
        ]
    );
} catch ( Exception $e ) {
    echo 'Error: ' . htmlspecialchars( $e->getMessage() );
}