ValidateDniNIE.js

/**
 * @namespace Custom validation related
 */
var customValidation = {
   
    /**
     * Known str_replace funcion. Required in valida_nif_cif_nie
     */
    str_replace: function(e, t, n) {
        var j;
        var r = e,
            i = t,
            s = n;
        var o = i instanceof Array,
            u = s instanceof Array,
            r = [].concat(r),
            i = [].concat(i),
            a = (s = [].concat(s)).length;
        while (j = 0, a--) {
            if (s[a]) {
                while (s[a] = s[a].split(r[j]).join(o ? i[j] || "" : i[0]), ++j in r) {}
            }
        }
        return u ? s : s[0];
    },

    /**
     * Validates Spanish ID number
     * @param {string} value DNI, NIE or CIF
     * @returns {number} 1 = NIF ok, 2 = CIF ok, 3 = NIE ok, -1 = NIF error, -2 = CIF error, -3 = NIE error, 0 = ??? error
     */
    validatesDniNifCif: function(value) {
        var j, posicion, letra, suma, i, temp1, temp2, n, pos;
        var a = this.cleanUpString(value);
        var temp = this.cleanUpString(value);
        var cadenadni = "TRWAGMYFPDXBNJZSQVHLCKE";

        if (temp !== '') {

            // If it doesn't has a valid format, returns error
            if ((!/^[A-Z]{1}[0-9]{7}[A-Z0-9]{1}$/.test(temp) && !/^[T]{1}[A-Z0-9]{8}$/.test(temp)) && !/^[0-9]{8}[A-Z]{1}$/.test(temp)) {
                return 0;
            }

            // Standard NIFs
            if (/^[0-9]{8}[A-Z]{1}$/.test(temp)) {
                posicion = a.substring(8, 0) % 23;
                letra = cadenadni.charAt(posicion);
                var letradni = temp.charAt(8);
                if (letra == letradni) {
                    return 1;
                } else {
                    return -1;
                }
            }

            // Type CIF codes
            suma = parseInt(a[2]) + parseInt(a[4]) + parseInt(a[6]);
            for (i = 1; i < 8; i += 2) {
                temp1 = 2 * parseInt(a[i]);
                temp1 += '';
                temp1 = temp1.substring(0, 1);
                temp2 = 2 * parseInt(a[i]);
                temp2 += '';
                temp2 = temp2.substring(1, 2);
                if (temp2 === '') {
                    temp2 = '0';
                }

                suma += (parseInt(temp1) + parseInt(temp2));
            }
            suma += '';
            n = 10 - parseInt(suma.substring(suma.length - 1, suma.length));

            // Special NIFs (Calculated as CIFs)
            if (/^[KLM]{1}/.test(temp)) {
                if (a[8] == String.fromCharCode(64 + n)) {
                    return 1;
                } else {
                    return -1;
                }
            }

            // CIF
            if (/^[ABCDEFGHJNPQRSUVW]{1}/.test(temp)) {
                temp = n + '';
                if (a[8] == String.fromCharCode(64 + n) || a[8] == parseInt(temp.substring(temp.length - 1, temp.length))) {
                    return 2;
                } else {
                    return -2;
                }
            }

            // NIE
            // T
            if (/^[T]{1}/.test(temp)) {
                if (a[8] == /^[T]{1}[A-Z0-9]{8}$/.test(temp)) {
                    return 3;
                } else {
                    return -3;
                }
            }

            // XYZ
            if (/^[XYZ]{1}/.test(temp)) {
                pos = this.str_replace(['X', 'Y', 'Z'], ['0', '1', '2'], temp).substring(0, 8) % 23;
                if (a[8] == cadenadni.substring(pos, pos + 1)) {
                    return 3;
                } else {
                    return -3;
                }
            }
        }

        return 0;

    }

}


jQuery.validator.addMethod("es_nifcifnie", function(value, element) {
    return this.optional(element) || customValidation.validatesDniNifCif(value) >= 1;
}, "Valid Spanish NIF, NIE or CIF for example 82451384H or X6909535J");

jQuery.validator.addMethod("nocif", function(value, element) {
    return this.optional(element) || customValidation.validatesDniNifCif(value) != 2;
}, "Just Spanish DNI or NIE please, no CIF");

ValidateDniNIE.php

<?php

class Validator {
  
	/**
	 * DNI/NIE validator
	 *
	 * @param string $dni Unfiltered DNI
	 * @return bolean If it's a DNI/NIE or not
	 */
	public static function dni($dni) {
		
		if(strlen($dni)<9) {
			return false;
		}
	 
		$dni = strtoupper($dni);
	 
		$letra = substr($dni, -1, 1);
		$numero = substr($dni, 0, 8);
	 
		// Si es un NIE hay que cambiar la primera letra por 0, 1 ó 2 dependiendo de si es X, Y o Z.
		$numero = str_replace(array('X', 'Y', 'Z'), array(0, 1, 2), $numero);	
	 
		$modulo = $numero % 23;
		$letras_validas = "TRWAGMYFPDXBNJZSQVHLCKE";
		$letra_correcta = substr($letras_validas, $modulo, 1);
	 
		if($letra_correcta!=$letra) {
			return false;
		}
		else {
			return true;
		}
	}

}

?>