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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: ``` $ 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(