country2langs.php

<?php

$data = file_get_contents( 'https://raw.githubusercontent.com/unicode-cldr/cldr-core/master/supplemental/territoryInfo.json' );
$data = json_decode( $data );

$country2langs = [];

foreach ( $data->supplemental->territoryInfo as $country => $data ) {
	if ( ! isset( $data->languagePopulation ) ) {
		continue;
	}

	$country = strtolower( $country );

	$language_population = [];
	foreach ( $data->languagePopulation as $language => $data ) {
		$language = strtok( $language, '_' );
		if ( 'en' == $language && ! in_array( $country, [ 'au', 'ca', 'nz', 'za', 'gb' ] ) ) {
			continue;
		}

		if ( (float) $data->_populationPercent > 18 || ( isset( $data->_officialStatus ) && in_array( $data->_officialStatus, [ 'official', 'official_regional' ] ) ) ) {
			$language_population[ $language ] = (float) $data->_populationPercent;
		}
	}

	if ( empty( $language_population ) ) {
		continue;
	}

	if ( ! isset( $country2langs[ $country ] ) ) {
		$country2langs[ $country ] = [];
	}

	arsort( $language_population );
	$language_population = array_keys( $language_population );

	if ( count( $language_population ) == 1 ) {
		$country2langs[ $country ] = reset( $language_population );
	} else {
		$country2langs[ $country ] = $language_population;
	}
}

$export = preg_replace( '/(\d+\s=>)/', '', var_export( $country2langs, true ) );

$export = preg_replace( '/(=>\s+array \()/m', '=> array(', $export );
$export = preg_replace( '/(\(\s+)/m', '( ', $export );
$export = preg_replace( '/(,\s{6}\')/m', ', \'', $export );
$export = preg_replace( '/(,\s{3}\))/m', ' )', $export );
$export = preg_replace( '/(  )/', "\t", $export );
$export = preg_replace( '/(^array \( )/', "array(\n\t", $export );

echo $export;