**Bad:**

**Not good:**

This is not good because`$breweryName` can be`NULL`.

function createMicrobrewery($name =null) {

// ...

function createMicrobrewery($breweryName ='Hipster Brew Co.')

   // ...

}

**Good**:

**Not bad:**

This opinion is more understandable than the previous version, but it better controls the value of the variable.

function createMicrobrewery($breweryName = 'Hipster Brew Co.') {

function createMicrobrewery($name = null)

{

   $breweryName = $name ?: 'Hipster Brew Co.';

// ...

}

**Good**:

If you support only PHP 7+, then you can use[type hinting](http://php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration) and be sure that the`$breweryName` will not be`NULL`.

function createMicrobrewery(string $breweryName = 'Hipster Brew Co.')

{

   // ...

}

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