Webmozart Assert
================
[](https://packagist.org/packages/webmozart/assert)
[](https://packagist.org/packages/webmozart/assert)
This library contains efficient assertions to test the input and output of
your methods. With these assertions, you can greatly reduce the amount of coding
needed to write a safe implementation.
All assertions in the [`Assert`] class throw an `Webmozart\Assert\InvalidArgumentException` if
they fail.
FAQ
---
**What's the difference to [beberlei/assert]?**
This library is heavily inspired by Benjamin Eberlei's wonderful [assert package],
but fixes a usability issue with error messages that can't be fixed there without
breaking backwards compatibility.
This package features usable error messages by default. However, you can also
easily write custom error messages:
```
Assert::string($path, 'The path is expected to be a string. Got: %s');
```
In [beberlei/assert], the ordering of the `%s` placeholders is different for
every assertion. This package, on the contrary, provides consistent placeholder
ordering for all assertions:
* `%s`: The tested value as string, e.g. `"/foo/bar"`.
* `%2$s`, `%3$s`, ...: Additional assertion-specific values, e.g. the
minimum/maximum length, allowed values, etc.
Check the source code of the assertions to find out details about the additional
available placeholders.
Installation
------------
Use [Composer] to install the package:
```bash
composer require webmozart/assert
```
Example
-------
```php
use Webmozart\Assert\Assert;
class Employee
{
public function __construct($id)
{
Assert::integer($id, 'The employee ID must be an integer. Got: %s');
Assert::greaterThan($id, 0, 'The employee ID must be a positive integer. Got: %s');
}
}
```
If you create an employee with an invalid ID, an exception is thrown:
```php
new Employee('foobar');
// => Webmozart\Assert\InvalidArgumentException:
// The employee ID must be an integer. Got: string
new Employee(-10);
// => Webmozart\Assert\InvalidArgumentException:
// The employee ID must be a positive integer. Got: -10
```
Assertions
----------
The [`Assert`] class provides the following assertions:
### Type Assertions
Method | Description
-------------------------------------------------------- | --------------------------------------------------
`string($value, $message = '')` | Check that a value is a string
`stringNotEmpty($value, $message = '')` | Check that a value is a non-empty string
`integer($value, $message = '')` | Check that a value is an integer
`integerish($value, $message = '')` | Check that a value casts to an integer
`positiveInteger($value, $message = '')` | Check that a value is a positive (non-zero) integer
`float($value, $message = '')` | Check that a value is a float
`numeric($value, $message = '')` | Check that a value is numeric
`natural($value, $message= ''')` | Check that a value is a non-negative integer
`boolean($value, $message = '')` | Check that a value is a boolean
`scalar($value, $message = '')` | Check that a value is a scalar
`object($value, $message = '')` | Check that a value is an object
`resource($value, $type = null, $message = '')` | Check that a value is a resource
`isCallable($value, $message = '')` | Check that a value is a callable
`isArray($value, $message = '')` | Check that a value is an array
`isTraversable($value, $message = '')` (deprecated) | Check that a value is an array or a `\Traversable`
`isIterable($value, $message = '')` | Check that a value is an array or a `\Traversable`
`isCountable($value, $message = '')` | Check that a value is an array or a `\Countable`
`isInstanceOf($value, $class, $message = '')` | Check that a value is an `instanceof` a class
`isInstanceOfAny($value, array $classes, $message = '')` | Check that a value is an `instanceof` at least one class on the array of classes
`notInstanceOf($value, $class, $message = '')` | Check that a value is not an `instanceof` a class
`isAOf($value, $class, $message = '')` | Check that a value is of the class or has one of its parents
`isAnyOf($value, array $classes, $message = '')` | Check that a value is of at least one of the classes or has one of its parents
`isNotA($value, $class, $message = '')` | Check that a value is not of the class or has not one of its parents
`isArrayAccessible($value, $message = '')` | Check that a value can be accessed as an array
`uniqueValues($values, $message = '')` | Check that the given array contains unique values
### Comparison Assertions
Method | Description
----------------------------------------------- | ------------------------------------------------------------------
`true($value, $message = '')` | Check that a value is `true`
`false($value, $message = '')` | Check that a value is `false`
`notFalse($value, $message = '')` | Check that a value is not `false`
`null($value, $message = '')` | Check that a value is `null`
`notNull($value, $message = '')` | Check that a value is not `null`
`isEmpty($value, $message = '')` | Check that a value is `empty()`
`notEmpty($value, $message = '')` | Check that a value is not `empty()`
`eq($value, $value2, $message = '')` | Check that a value equals another (`==`)
`notEq($value, $value2, $message = '')` | Check that a value does not equal another (`!=`)
`same($value, $value2, $message = '')` | Check that a value is identical to another (`===`)
`notSame($value, $value2, $message = '')` | Check that a value is not identical to another (`!==`)
`greaterThan($value, $value2, $message = '')` | Check that a value is greater than another
`greaterThanEq($value, $value2, $message = '')` | Check that a value is greater than or equal to another
`lessThan($value, $value2, $message = '')` | Check that a value is less than another
`lessThanEq($value, $value2, $message = '')` | Check that a value is less than or equal to another
`range($value, $min, $max, $message = '')` | Check that a value is within a range
`inArray($value, array $values, $message = '')` | Check that a value is one of a list of values
`oneOf($value, array $values, $message = '')` | Check that a value is one of a list of values (alias of `inArray`)
### String Assertions
You should check that a value is a string with `Assert::string()` before making
any of the following assertions.
Method | Description
--------------------------------------------------- | -----------------------------------------------------------------
`contains($value, $subString, $message = '')` | Check that a string contains a substring
`notContains($value, $subString, $message = '')` | Check that a string does not contain a substring
`startsWith($value, $prefix, $message = '')` | Check that a string has a prefix
`notStartsWith($value, $prefix, $message = '')` | Check that a string does not have a prefix
`startsWithLetter($value, $message = '')` | Check that a string starts with a letter
`endsWith($value, $suffix, $message = '')` | Check that a string has a suffix
`notEndsWith($value, $suffix, $message = '')` | Check that a string does not have a suffix
`regex($value, $pattern, $message = '')` | Check that a string matches a regular expression
`notRegex($value, $pattern, $message = '')` | Check that a string does not match a regular expression
`unicodeLetters($value, $message = '')` | Check that a string contains Unicode letters only
`alpha($value, $message = '')` | Check that a string contains letters only
`digits($value, $message = '')` | Check that a string contains digits only
`alnum($value, $message = '')` | Check that a string contains letters and digits only
`lower($value, $message = '')` | Check that a string contains lowercase characters only
`upper($value, $message = '')` | Check that a string contains uppercase characters only
`length($value, $length, $message = '')` | Check that a string has a certain number of characters
`minLength($value, $min, $message = '')` | Check that a string has at least a certain number of characters
`maxLength($value, $max, $message = '')` | Check that a string has at most a certain number of characters
`lengthBetween($value, $min, $max, $message = '')` | Check that a string has a length in the given range
`uuid($value, $message = '')` | Check that a string is a valid UUID
`ip($value, $message = '')` | Check that a string is a valid IP (either IPv4 or IPv6)
`ipv4($value, $message = '')` | Check that a string is a valid IPv4
`ipv6($value, $message = '')` | Check that a string is a valid IPv6
`email($value, $message = '')` | Check that a string is a valid e-mail address
`notWhitespaceOnly($value, $message = '')` | Check that a string contains at least one non-whitespace character
### File Assertions
Method | Description
----------------------------------- | --------------------------------------------------
`fileExists($value, $message = '')` | Check that a value is an existing path
`file($value, $message = '')` | Check that a value is an existing file
`directory($value, $message = '')` | Check that a value is an existing directory
`readable($value, $message = '')` | Check that a value is a readable path
`writable($value, $message = '')` | Check that a value is a writable path
### Object Assertions
Method | Description
----------------------------------------------------- | --------------------------------------------------
`classExists($value, $message = '')` | Check that a value is an existing class name
`subclassOf($value, $class, $message = '')` | Check that a class is a subclass of another
`interfaceExists($value, $message = '')` | Check that a value is an existing interface name
`implementsInterface($value, $class, $message = '')` | Check that a class implements an interface
`propertyExists($value, $property, $message = '')` | Check that a property exists in a class/object
`propertyNotExists($value, $property, $message = '')` | Check that a property does not exist in a class/object
`methodExists($value, $method, $message = '')` | Check that a method exists in a class/object
`methodNotExists($value, $method, $message = '')` | Check that a method does not exist in a class/object
### Array Assertions
Method | Description
-------------------------------------------------- | ------------------------------------------------------------------
`keyExists($array, $key, $message = '')` | Check that a key exists in an array
`keyNotExists($array, $key, $message = '')` | Check that a key does not exist in an array
`validArrayKey($key, $message = '')` | Check that a value is a valid array key (int or string)
`count($array, $number, $message = '')` | Check that an array contains a specific number of elements
`minCount($array, $min, $message = '')` | Check that an array contains at least a certain number of elements
`maxCount($array, $max, $message = '')` | Check that an array contains at most a certain number of elements
`countBetween($array, $min, $max, $message = '')` | Check that an array has a count in the given range
`isList($array, $message = '')` | Check that an array is a non-associative list
`isNonEmptyList($array, $message = '')` | Check that an array is a non-associative list, and not empty
`isMap($array, $message = '')` | Check that an array is associative and has strings as keys
`isNonEmptyMap($array, $message = '')` | Check that an array is associative and has strings as keys, and is not empty
### Function Assertions
Method | Description
------------------------------------------- | -----------------------------------------------------------------------------------------------------
`throws($closure, $class, $message = '')` | Check that a function throws a certain exception. Subclasses of the exception class will be accepted.
### Collection Assertions
All of the above assertions can be prefixed with `all*()` to test the contents
of an array or a `\Traversable`:
```php
Assert::allIsInstanceOf($employees, 'Acme\Employee');
```
### Nullable Assertions
All of the above assertions can be prefixed with `nullOr*()` to run the
assertion only if it the value is not `null`:
```php
Assert::nullOrString($middleName, 'The middle name must be a string or null. Got: %s');
```
### Extending Assert
The `Assert` class comes with a few methods, which can be overridden to change the class behaviour. You can also extend it to
add your own assertions.
#### Overriding methods
Overriding the following methods in your assertion class allows you to change the behaviour of the assertions:
* `public static function __callStatic($name, $arguments)`
* This method is used to 'create' the `nullOr` and `all` versions of the assertions.
* `protected static function valueToString($value)`
* This method is used for error messages, to convert the value to a string value for displaying. You could use this for representing a value object with a `__toString` method for example.
* `protected static function typeToString($value)`
* This method is used for error messages, to convert the a value to a string representing its type.
* `protected static function strlen($value)`
* This method is used to calculate string length for relevant methods, using the `mb_strlen` if available and useful.
* `protected static function reportInvalidArgument($message)`
* This method is called when an assertion fails, with the specified error message. Here you can throw your own exception, or log something.
## Static analysis support
Where applicable, assertion functions are annotated to support Psalm's
[Assertion syntax](https://psalm.dev/docs/annotating_code/assertion_syntax/).
A dedicated [PHPStan Plugin](https://github.com/phpstan/phpstan-webmozart-assert) is
required for proper type support.
Authors
-------
* [Bernhard Schussek] a.k.a. [@webmozart]
* [The Community Contributors]
Contribute
----------
Contributions to the package are always welcome!
* Report any bugs or issues you find on the [issue tracker].
* You can grab the source code at the package's [Git repository].
License
-------
All contents of this package are licensed under the [MIT license].
[beberlei/assert]: https://github.com/beberlei/assert
[assert package]: https://github.com/beberlei/assert
[Composer]: https://getcomposer.org
[Bernhard Schussek]: https://webmozarts.com
[The Community Contributors]: https://github.com/webmozart/assert/graphs/contributors
[issue tracker]: https://github.com/webmozart/assert/issues
[Git repository]: https://github.com/webmozart/assert
[@webmozart]: https://twitter.com/webmozart
[MIT license]: LICENSE
[`Assert`]: src/Assert.php
The Future of Digital Wallets: How Mobile Payments are Shaping the Financial Landscape
Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly efficient method for handling payments and transactions. By consolidating credit, debit, and loyalty card information into a single app, digital wallets simplify the payment process and eliminate the need for physical cards, enhancing both convenience and security. As digital wallets evolve, they are integrating advanced features that push the boundaries of traditional payment methods. Biometric authentication, such as fingerprint and facial recognition, adds an extra layer of security, ensuring that only authorized users can access their payment information. Real-time transaction alerts provide instant notifications for every transaction, allowing users to monitor their spending and detect any unauthorized activity swiftly. Budgeting tools within digital wallets offer personalized insights and financial management capabilities, helping users track their expenses and plan their budgets more effectively. The growing adoption of digital wallets is fueled by their ease of use and the increasing demand for contactless payment solutions. As technology advances, digital wallets are likely to incorporate even more innovative features, such as artificial intelligence for personalized financial advice, integrated loyalty programs for seamless rewards management, and cross-border transaction capabilities for global shopping convenience. The integration of these features is reshaping the financial landscape by making transactions not only faster but also more secure and user-friendly. The future of digital wallets is set to further revolutionize how we handle our finances, offering an all-encompassing solution that caters to the evolving needs of modern consumers. As digital wallets continue to advance, they will play an increasingly central role in shaping the future of financial interactions, driving the global shift towards a more digital and cashless economy.
In the digital age, privacy concerns have become increasingly paramount, prompting the European Union to enact the General Data Protection Regulation (GDPR) in 2018. Among its many provisions, GDPR sets strict guidelines for the collection and processing of personal data, including the use of cookies on websites. Privacy Policy
