Relevanssi Arabic support

relevanssi-arabic.php

<?php

add_filter( 'relevanssi_remove_punctuation', 'rlv_arabic_remap', 9 );
function rlv_arabic_remap( $a ) {
    $remap = array(
        'إ' => 'ا',
        'آ' => 'ا',
        'أ' => 'ا',
        'ئ' => 'ى',
        'ة' => 'ه',
        'ؤ' => 'و',
        'ـ' => '',
        'آ' => 'ا',
    );

    $diacritics = array(
        '~[\x{0600}-\x{061F}]~u',   
        '~[\x{063B}-\x{063F}]~u',   
        '~[\x{064B}-\x{065E}]~u',   
        '~[\x{066A}-\x{06FF}]~u',   
    );

    $a = preg_replace( $diacritics, '', $a );
    $a = str_replace( array_keys( $remap ), array_values( $remap ), $a );

    return $a;
}