ADD support for EGP (Egyptian currency) to Sprout Invoices

sprout_egp.php

<?php 
// do not include above code

function si_filter_localeconv( $localeconv = array(), $doc_id = 0, $locale = '' ) {
    switch ( $locale ) {
        case 'en_GB':
            $localeconv = egp_local_array();
            break;
        case 'en_US':
            $localeconv = us_local_array();
            break;
    }
    return $localeconv;
}
add_filter( 'si_get_localeconv', 'si_filter_localeconv', 10, 3 );
function us_local_array() {
    return array(
        'decimal_point' => '.',
        'thousands_sep' => '',
        'int_curr_symbol' => 'USD',
        'currency_symbol' => '$',
        'mon_decimal_point' => '.',
        'mon_thousands_sep' =>  ',',
        'positive_sign' => '',
        'negative_sign' => '-',
        'int_frac_digits' => 2,
        'frac_digits' => 2,
        'p_cs_precedes' => 1,
        'p_sep_by_space' => 0,
        'n_cs_precedes' => 1,
        'n_sep_by_space' => 0,
        'p_sign_posn' => 1,
        'n_sign_posn' => 1,
        'grouping' => array(),
        'mon_grouping' => array( 3, 3 ),
    );
}
function egp_local_array() {
    return array(
        'decimal_point' => ',',
        'thousands_sep' => '.',
        'int_curr_symbol' => 'E£',
        'currency_symbol' => 'E£',
        'mon_decimal_point' => ',',
        'mon_thousands_sep' =>  '.',
        'positive_sign' => '',
        'negative_sign' => '-',
        'int_frac_digits' => 2,
        'frac_digits' => 2,
        'p_cs_precedes' => 1,
        'p_sep_by_space' => 0,
        'n_cs_precedes' => 1,
        'n_sep_by_space' => 0,
        'p_sign_posn' => 1,
        'n_sign_posn' => 1,
        'grouping' => array(),
        'mon_grouping' => array( 3, 3 ),
    );
}