Salary Filter

add_action( 'job_manager_job_filters_search_jobs_end', 'filter_by_salary_field' );
function filter_by_salary_field() {
    ?>
    <div class="search_categories" style="padding-left: .5em !important;padding-right: 0em !important;">
        <label for="search_categories"><?php _e( 'Salary', 'wp-job-manager' ); ?></label>
        <select name="filter_by_salary" class="job-manager-filter">
            <option value=""><?php _e( 'Any Salary', 'wp-job-manager' ); ?></option>
            <option value="upto10"><?php _e( 'Up to £10,000', 'wp-job-manager' ); ?></option>
            <option value="15000-20000"><?php _e( '£15,000 to £20,000 (£7.50 to £9.60ph)', 'wp-job-manager' ); ?></option>
            <option value="20000-25000"><?php _e( '£20,000 to £25,000', 'wp-job-manager' ); ?></option>
            <option value="over40"><?php _e( '£40,000+', 'wp-job-manager' ); ?></option>
        </select>
    </div>
    <?php
}
/**
 * This code gets your posted field and modifies the job search query
 */
add_filter( 'job_manager_get_listings', 'filter_by_salary_field_query_args', 10, 2 );
function filter_by_salary_field_query_args( $query_args, $args ) {
    if ( isset( $_POST['form_data'] ) ) {
        parse_str( $_POST['form_data'], $form_data );
        // If this is set, we are filtering by salary
        if ( ! empty( $form_data['filter_by_salary'] ) ) {
            $selected_range = sanitize_text_field( $form_data['filter_by_salary'] );
            switch ( $selected_range ) {
                case 'upto10' :
                    $query_args['meta_query'][] = array(
                        'key'     => '_job_salary',
                        'value'   => '10000',
                        'compare' => '<',
                        'type'    => 'NUMERIC'
                    );
                break;
                case 'over40' :
                    $query_args['meta_query'][] = array(
                        'key'     => '_job_salary',
                        'value'   => '40000',
                        'compare' => '>=',
                        'type'    => 'NUMERIC'
                    );
                break;
                default :
                    $query_args['meta_query'][] = array(
                        'key'     => '_job_salary',
                        'value'   => array_map( 'absint', explode( '-', $selected_range ) ),
                        'compare' => 'BETWEEN',
                        'type'    => 'NUMERIC'
                    );
                break;
            }
            // This will show the 'reset' link
            add_filter( 'job_manager_get_listings_custom_filter', '__return_true' );
        }
    }
    return $query_args;
}