Laravel 5: Conditionally Throwing Exceptions With throw_unless

The throw_unless helper function is the logical counterpart to the throw_if helper function. If the provided $boolean value evaluates to false, a new instance of the provided exception will be created and thrown. Any parameters specified will be passed to the exceptions constructor when it is instantiated.

#Signature

The signature of the throw_unless function is:

1function throw_unless(
2    $boolean,
3    $exception,
4    ...$parameters
5);

#Example Use

In the following example we rewrite the throw_if example to use the throw_unless function. This example function will throw an exception when the supplied $value is equal to 10.

 1
 2function throwUnlessExample($value) {
 3    throw_unless(
 4        $value != 10,
 5        Exception::class,
 6        'The value must not be 10!'
 7    );
 8
 9    // Do something with the value when it is not 10.
10}
11
12// Will not throw an exception.
13throwUnlessExample(3);
14
15// Will throw an exception.
16throwUnlessExample(10);

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