README

The Validation Component of Everest is ment to validate user input in a simple and intuitive way.

Installing

Simply go to your project directory where the composer.json file is located and type:

	composer require everest/validation

Usage

This package offers two methods of data validation. You can either validate a single value on a specific requirement (type) or you can validate one or more validation chains on each key of an array or array like object.

Validating single value

use Everest\Validation\Validation;

$int = Validation::integer('10'); // $int -> 10
$noint = Validation::integer('foo'); // Will throw \Everest\Validation\InvalidValidationException

Validating an array of values using a validation chain

use Everest\Validation\Validate;

$data = [
	'foo' => '10',
	'bar' => 'foo'
];

$data = Validate::lazy($data)
	->that('foo')->integer()->between(0, 20)
	->that('bar')->enum(['bar', 'foo'])->upperCase()
	->execute();

// $data -> ['foo' => 10, 'bar' => 'FOO']

You can use additional validation chains by seperating them with ->or()

use Everest\Validation\Validate;

$data = [
	'bar' => 'foo'
];

$data = Validate::lazy($data)
	->that('bar')->integer()->between(0, 20)
	->or()->string()->minLength(2)
	->execute();

// $data -> ['bar' => 'FOO']

Strict and lazy validation

One can choose between Validate::strict() and Validate::lazy(). First will throw an InvalidValidationException on the first occuring error and the last will collect all occuring errors and will throw a InvalidLazyValidationException, which provices a ::getErrors() and ::getErrorsGroupedByKey() method to access all bundled InvalidValidationException exceptions.

Validating nested arrays

One can use dot-notation to validate nested values.

use Everest\Validation\Validate;

$data = [
	'foo' => [
		['bar' => 1, 'name' => 'Some name'],
		['bar' => 2, 'name' => 'Some other name']
	]
];

$data = Validate::lazy($data)
	->that('foo.*.bar')->integer()->between(0, 20)
	->that('foo.*.name')->string()->upperCase()
	->execute();

// $data -> [
//   'foo' => [
//     ['bar' => 1, 'name' => 'SOME NAME'],
//     ['bar' => 2, 'name' => 'SOME OTHER NAME']
//   ]
// ]

Optional parameters

Parameters can be marked as optional and as optional with default. If the validation ueses a default value as fallback this value is NOT validated by the validation chain anymore!

use Everest\Validation\Validate;

$data = ['foo' => 10];

$result = Validate::lazy($data)
	->that('foo')->integer()
	->that('bar')->optional(/* no default */)->integer()
	->execute();

// $result -> ['foo' => 10]

$result = Validate::lazy($data)
	->that('foo')->integer()
	->that('bar')->optional(null)->integer()
	->execute();

// $result -> ['foo' => 10, 'bar' => null]

Types

Types are rules that a supplied value has to fulfill.

Array

Validation::array($value), validates that given value is an array.

Between

Validation::between($value, numeric $min, numeric $max), validates that given value holds $min <= $value <= $max.

Boolean

Validation::boolean($value), validates that given value is a boolean or booleanish value. The result will be casted to a boolean. This type inteprets $value as follows:

Every other value will throw an InvalidValidationException.

DateTime

Validation::dateTime($value, string $pattern), validates that given value matches the supplied date pattern and returns a new DateTime instance.

DateTimeImmutable

Same as DateTime but returns a new DateTimeImmutable instance.

Enum

Validation::dateTime($value, array $enum), validates that given value matches one of the $enum values. If $enum is an assoc array it tryes to match $value against the keys and returns the associated value.

Float

Validation::float($value), validates that given value is numeric. The result will be casted to a float.

Integer

Validation::integer($value), validates that given value is an integer or integerish. The result will be casted to an integer.

KeyExists

Validation::keyExisits($value, $key), validates that given value is an array and that the supplied key exists in this array.

Length

Validation::length($value, int $length), validates that given value matches the supplied string length using strlen.

LengthBetween

Validation::lengthBetween($value, int $min, int $max), validates that given values string length is between supplied minimum and maximum.

LengthMax

Validation::lengthMax($value, int $max), validates that given values string length lower or equal supplied maximum.

LengthMin

Validation::lengthMin($value, int $min), validates that given values string length greater or equal supplied minimum.

Max

Validation::max($value, int $max), validates that the given numerical value is lower or equal supplied maximum.

Min

Validation::min($value, int $max), validates that the given numerical value is greater or equal supplied minimum.

NotEmpty

Validation::notEmpty($value), validates that the given value is not empty.

Null

Validation::null($value), validates that the given value is null.

String

Validation::string($value), validates that the given value is a string.

Filters

Filters can be used to transfrom the validated result.

LowerCase

Validation::lowerCase($value), executes strtolower on the supplied value.

StripTags

Validation::stripTags($value), executes strip_tags on the supplied value.

Trim

Validation::trim($value), executes trim on the supplied value.

UpperCase

Validation::upperCase($value), executes strtoupper on the supplied value.

Custom Types

One can add custom types by creating a new class that extends from Everest\Validation\Types\Type.

<?php

class CustomType extends \Everest\Validation\Types\Type {

	public static $errorName = 'invalid_custom_error';
	public static $errorMessage = '%s is not a valid custom type.';

	public function __invoke($value, $message = null, string $key = null, $customArg1 = null, $customArg2 = null)
	{
		if (/* Your invalid condition here */) {
			$message = sprintf(
				self::generateErrorMessage($message ?: self::$errorMessage),
				self::stringify($value)
			);

			throw new InvalidValidationException(self::$errorName, $message, $key, $value);
		}

		/**
		 * You may transform/cast the result before retuning it.
		 * In this case it is usefull to add a custom argument as 
		 * `$doCast` = false flag
		 */
		

		return $value;
	}
}

In the next step you need to connect your type with the Everest\Validation\Validation class.

<?php

// Add as class. A singleton instance will be created when the type is requested the first time
\Everest\Validation\Validation::addType('custom_name', CustomType::CLASS);

// Add as instance. You can also supply a instance of your custom type. 
// E.g. when you need to do some configuration in `__construct()`
\Everest\Validation\Validation::addType('custom_name', new CustomType());

If you want to overload an existing type you need to pass true as third argument to \Everest\Validation\Validation::addType.

Now you can use the custom type by Validation::custom_type($var) or in a validation chain with ->custom_type().

License

This project is licensed under the MIT License - see the LICENSE.md file for details