Custom max selected based on selected packages for WP Job Manager Field Editor

functions.php

<?php

add_filter( 'submit_job_form_fields', 'smyles_custom_max_selected_fields_per_package', 101 );

function smyles_custom_max_selected_fields_per_package( $fields ){

	$max_packages = array(
		// The key should be the ID of the product
		'11130' => array(
				'job_category' => 3,
				'job_region' => 1,
				'main_image' => 1,
		),
		// So below, the product ID is 11189
		'11189' => array(
				'job_category' => 5,
				'job_region' => 1,
				'main_image' => 1,
		),
		'12515' => array(
				'job_category' => 10,
				'job_region' => 3,
				'main_image' => 1,
		),
		'12439' => array(
				'job_category' => 10,
				'job_region' => 3,
				'main_image' => 1,
		),
	);

	$product_id = isset( $_REQUEST['wcpl_jmfe_product_id'] ) ? intval( $_REQUEST['wcpl_jmfe_product_id'] ) : '';
	$job_package = isset( $_REQUEST['job_package'] ) ? sanitize_text_field( $_REQUEST['job_package'] ) : $product_id;
	$job_id = isset( $_REQUEST['job_id'] ) ? intval( $_REQUEST['job_id'] ) : FALSE;

	// Product/Package Handling, get job_package from post meta
	if ( $job_id && empty( $job_package ) && class_exists( 'WP_Job_Manager_Field_Editor_Package_WC' ) ) {
		$job_package = WP_Job_Manager_Field_Editor_Package_WC::get_post_package_id( $job_id );
	}

	if( ! empty( $job_package ) && array_key_exists( $job_package, $max_packages ) ){

		// job_category max selected set
		if( array_key_exists( 'job', $fields ) && array_key_exists( 'job_category', $fields['job'] ) ){
			$fields['job']['job_category']['max_selected'] = $max_packages[ $job_package ][ 'job_category' ];
		}

		// job_region max selected set
		if( array_key_exists( 'job', $fields ) && array_key_exists( 'job_region', $fields['job'] ) ){
			$fields['job']['job_region']['max_selected'] = $max_packages[ $job_package ][ 'job_region' ];
		}

		// main_image max selected set
		if( array_key_exists( 'company', $fields ) && array_key_exists( 'main_image', $fields['company'] ) ){
			$fields['company']['main_image']['max_uploads'] = $max_packages[ $job_package ][ 'max_uploads' ];
		}
	}

	return $fields;
}