(PHP Template) A single apostrophe ' breaks php-template highlighting

**Describe the issue**
An apostrophe `'` that exists on its own without being closed seems to break highlighting of everything that comes after it even if it's in a comment or escaped but only with the language `php-template`. With `php` it works fine as it should.

Funnily if anywhere later this `'` is "closed" it works again.

**Which language seems to have the issue?**
`php-template`

**Are you using `highlight` or `highlightAuto`?**
Highlight, not auto.

**Sample Code to Reproduce**
Code: See expected behaviour

**Not highlighted:**

```

Some HTML

```


**Correctly highlighted:**
```

Some HTML

```

**Expected behavior**
Github highlights the php bits:

```php

Some HTML

```

I expect it to highlight the code correctly even if not every ' is closed. In a comment for instance, English words allow for shortcuts with ' for instance "don't" or "can't".

**Additional observations**
Its breaks only if the apostrophe is in PHP code (not HTML) and if it's not in a code block comment /* such as this, that won't cause any troubles */.
It's always everything that comes after it that is broken not before so if half the file doesn't contain a `'` and then suddenly a php part with a `'` either in a `// comment '` or in a string `'string \' with an apostrophe'` the bottom half of the file is not highlighted.