Test for missing letter but 26 characters (#256)
Test for missing letter but 26 characters (#256)

I have found solutions to this exercise, that return `true` for the string `Tthe quick brown fo jumps over the lazy dog` ("x" is missing). One example for this would be the following code:
```php
<?php
function isPangram($str) {
	preg_match_all("/[A-z]/", $str, $matches);

	return count(array_unique($matches[0])) >= 26;
}
```
camilopayan/xphp,camilopayan/xphp,exercism/xphp,exercism/xphp