Laravel ORCID validation rule - see: https://learntech.imsu.ox.ac.uk/blog/angular-reactive-form-custom-validator-for-orcid/

Orcid.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class Orcid implements Rule
{
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $urlParts = explode("/",$value);
		// get last digit
        $lastDigit = substr($urlParts[count($urlParts) - 1],-1);
        // let's get numbers from last part (removing any hyphens, etc)
		$orcidDigits = preg_replace('/\D/', '', $urlParts[count($urlParts) - 1]);
        // strip last digit
        $baseDigits = substr($orcidDigits, 0, -1);
        // get check digit - 0-9 or X
        $generatedCheckDigit = $this->generateCheckDigit($baseDigits);
        return $generatedCheckDigit === $lastDigit; 
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The 16-digit number in the ORCID ID must have the correct checksum - please check it carefully';
    }
	
	/** 
	  * Generates check digit as per ISO 7064 11,2 - see https://support.orcid.org/knowledgebase/articles/116780-structure-of-the-orcid-identifier
	  * 
	  */ 
	private function generateCheckDigit($baseDigits) { 
		$total = 0; 
		for ($i = 0; $i < strlen($baseDigits); $i++) { 
			$digit = intval(substr($baseDigits,$i,1)); 
			$total = ($total + $digit) * 2; 
		} 
		$remainder = $total % 11; 
		$result = (12 - $remainder) % 11; 
		if($result == 10) {
			return "X";
		} else {
			return strval($result);
		}
	}
}