generateUpperCharTable.php

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

class GenerateUpperCharTable extends Maintenance {

    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Generates the lowercase => uppercase json table' );
        $this->addOption( 'outfile', 'Output file', true, true, 'o' );
    }

    public function execute() {
        $outfile = $this->getOption( 'outfile', 'upperchar.json' );
        $toUpperTable = [];
        for ( $i = 0; $i <= 0x10ffff; $i++ ) {
            // skip all surrogate codepoints or json_encode would fail.
            if ( $i >= 0xd800 && $i <= 0xdfff ) {
                continue;
            }
            $char = UtfNormal\Utils::codepointToUtf8( $i );
            $upper = mb_strtoupper( $char );
            $toUpperTable[$char] = $upper;
        }
        file_put_contents( $outfile, json_encode( $toUpperTable ) );
    }
}

$maintClass = GenerateUpperCharTable::class;
require_once RUN_MAINTENANCE_IF_MAIN;