validate.php

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<?php
if ( !isset( $argv[1] ) ) {
        print "Usage: php {$argv[0]} <filename>\n";
        exit( 1 );
}
array_shift( $argv );

define( 'MEDIAWIKI', 1 );
define( 'NOT_REALLY_MEDIAWIKI', 1 );

$IP = dirname( __FILE__ ) . '/../..';

require_once( "$IP/includes/Defines.php" );
require_once( "$IP/languages/Language.php" );

$files = array();
foreach ( $argv as $arg ) {
        $files = array_merge( $files, glob( $arg ) );
}

foreach ( $files as $filename ) {
        print "$filename...";
        $vars = getVars( $filename );
        $keys = array_keys( $vars );
        $diff = array_diff( $keys, Language::$mLocalisationKeys );
        if ( $diff ) {
                print "\nWarning: unrecognised variable(s): " . implode( ', ', $diff ) . "\n";
        } else {
                print " ok\n";
        }
}

function getVars( $filename ) {
        require( $filename );
        $vars = get_defined_vars();
        unset( $vars['filename'] );
        return $vars;
}