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 \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:

$ composer require webmozart/assert

Example

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:

new Employee('foobar');
// => InvalidArgumentException: 
//    The employee ID must be an integer. Got: string

new Employee(-10);
// => InvalidArgumentException: 
//    The employee ID must be a positive integer. Got: -10

Assertions

The Assert class provides the following assertions:

Type Assertions

Method -------------------------------------------------------- string($value, $message = '') stringNotEmpty($value, $message = '') integer($value, $message = '') integerish($value, $message = '') float($value, $message = '') numeric($value, $message = '') natural($value, $message= ''') boolean($value, $message = '') scalar($value, $message = '') object($value, $message = '') resource($value, $type = null, $message = '') isCallable($value, $message = '') isArray($value, $message = '') isTraversable($value, $message = '') isIterable($value, $message = '') isCountable($value, $message = '') isInstanceOf($value, $class, $message = '') isInstanceOfAny($value, array $classes, notInstanceOf($value, $class, $message = '') isArrayAccessible($value, $message = '') | Description | -------------------------------------------------- | Check that a value is a string | Check that a value is a non-empty string | Check that a value is an integer | Check that a value casts to an integer | Check that a value is a float | Check that a value is numeric | Check that a value is a non-negative integer | Check that a value is a boolean | Check that a value is a scalar | Check that a value is an object | Check that a value is a resource | Check that a value is a callable | Check that a value is an array (deprecated) | Check that a value is an array or a \Traversable | Check that a value is an array or a \Traversable | Check that a value is an array or a \Countable | Check that a value is an instanceof a class $message = '') | Check that a value is an instanceof a at least one class on the array of classes | Check that a value is not an instanceof a class | Check that a value can be accessed as an array

Comparison Assertions

Method | Description ----------------------------------------------- | -------------------------------------------------- true($value, $message = '') | Check that a value is true false($value, $message = '') | Check that a value is false null($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, $message = '') | Check that a value is within a range oneOf($value, array $values, $message = '') | Check that a value is one of a list of values

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, $message = '') | Check that a string does not contains a substring startsWith($value, $prefix, $message = '') | Check that a string has a prefix startsWithLetter($value, $message = '') | Check that a string starts with a letter endsWith($value, $suffix, $message = '') | Check that a string has a suffix regex($value, $pattern, $message = '') | Check that a string matches a regular expression notRegex($value, $pattern, $message = '') | Check that a string does not match a regular expression alpha($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, $message = '') | Check that a string is a valid IPv6 notWhitespaceOnly($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, $message = '') | Check that a key does not exist in an array count($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, $message = '') | Check that an array is a non-associative list isMap($array, $message = '') | Check that an array is associative and has strings as keys

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:

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:

Assert::nullOrString($middleName, 'The middle name must be a string or null. Got: %s');

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.

Support

If you are having problems, send a mail to bschussek@gmail.com or shout out to @webmozart on Twitter.

License

All contents of this package are licensed under the MIT license.

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