EncodingMangler.php

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<?php
class EncodingMangler implements StagingHelper {
    protected $use_transliterator = false;
    protected $transliterator;
 
    public function __construct() {
        if ( class_exists( Transliterator::class ) ) {
            $this->use_transliterator = true;
            // Use Any-Latin to munge Cyrillic, Kanji, etc
            // Then convert anything outside the ISO-8859-1 range to nearest ASCII
            $this->transliterator = Transliterator::create( 'Any-Latin; [^a-ÿ] Latin-ASCII' );
        }
    }
 
    public function stage( GatewayType $adapter, $normalized, &$stagedData ) {
        foreach ( array_keys( $stagedData ) as $key ) {
            $stagedData[$key] = $this->transliterate( $stagedData[$key] );
        }
    }
 
    public function transliterate( $value ) {
        if ( $this->use_transliterator ) {
            return $this->transliterator->transliterate( $value );
        }
        $iso = iconv( 'UTF-8', 'ISO-8859-1//TRANSLIT', $value );
        return iconv( 'ISO-8859-1', 'UTF-8', $iso );
    }
}