Verify that deprecated language codes are identical to their replacements in the WMF interwiki map
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	• Lucas_Werkmeister_WMDE
	Jan 27 2023, 2:28 PM

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Verify that deprecated language codes are identical to their replacements in the WMF interwiki map
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	<?php

	$deprecatedMapping = [ // LanguageCode::DEPRECATED_LANGUAGE_CODE_MAPPING
	// Note that als is actually a valid ISO 639 code (Tosk Albanian), but it
	// was previously used in MediaWiki for Alsatian, which comes under gsw
	'als' => 'gsw', // T25215
	'bat-smg' => 'sgs', // T27522
	'be-x-old' => 'be-tarask', // T11823
	'fiu-vro' => 'vro', // T31186
	'roa-rup' => 'rup', // T17988
	'zh-classical' => 'lzh', // T30443
	'zh-min-nan' => 'nan', // T30442
	'zh-yue' => 'yue', // T30441
	];
	$interwikiCache = eval( '?>' . file_get_contents( 'https://noc.wikimedia.org/conf/interwiki.php.txt' ) );
	$i = 1;
	$ok = true;

	foreach ( $interwikiCache as $key => $value ) {
	[ $prefix, $interwiki ] = explode( ':', $key, 2 );
	if ( ( $replacementInterwiki = $deprecatedMapping[ $interwiki ] ?? null ) !== null ) {
	$replacementKey = "$prefix:$replacementInterwiki";
	if ( ( $replacementValue = $interwikiCache[ $replacementKey ] ) === $value ) {
	echo "ok $i - $key == $replacementKey" . PHP_EOL;
	} else {
	echo "not ok $i - $key ($value) !== $replacementKey ($replacementValue)" . PHP_EOL;
	$ok = false;
	}
	++$i;
	}
	}

	exit( $ok ? 0 : 1 );

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