This one is faster than `strncmp()`:
```
0.0033109188079834 ms this
0.01307487487793 ms strncmp
```
We may want to change usage in getAlias() too.
```php
<?php

$string = '@namespace/hallo';

$t = microtime(true);
for($n = 0; $n< 10000 ; $n++) {
	$a = ($string[0] === '@');
}

echo (microtime(true) - $t). " ms\n";

$t = microtime(true);
for($n = 0; $n< 10000 ; $n++) {
	$a = strncmp($string, '@', 1);
}

echo (microtime(true) - $t). " ms\n";
```