assert

Open source

Assertions to validate method input/output with nice error messages.

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About

Assertions to validate method input/output with nice error messages.

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, $message = '')`	Check that a value is a positive (non-zero) integer
`negativeInteger($value, $message = '')`	Check that a value is a negative integer
`notNegativeInteger($value, $message = '')`	Check that a value is a non-negative integer
`float($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, $message = '')`	Check that a value is an object
`objectish($value, $message = '')`	Check that a value is an object or a string of a class that exists
`resource($value, $type = null, $message = '')`	Check that a value is a resource
`isInitialized($value, $property, $message = '')`	Check that a value has an initialized property
`isCallable($value, $message = '')`	Check that a value is a callable
`isArray($value, $message = '')`	Check that a value is an array
`isIterable($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, $message = '')`	Check that a value is not an `instanceof` a class
`isNotInstanceOfAny($value, array $classes, $message = '')`	Check that a value is not an `instanceof` at least one class on the array of classes
`isAOf($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, $message = '')`	Check that a value is one of a list of values
`notInArray($value, array $values, $message = '')`	Check that a value is not one of a list of values
`oneOf($value, array $values, $message = '')`	Check that a value is one of a list of values (alias of `inArray`)
`notOneOf($value, array $values, $message = '')`	Check that a value is not one of a list of values (alias of `notInArray`)

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 cla