getch() public méthode

Scans one character and returns it. This method is multibyte character sensitive.
public getch ( )
 public function testGetch()
 {
     $s = new StringScanner("ab");
     $this->assertEquals('a', $s->getch());
     $this->assertEquals('b', $s->getch());
     $this->assertNull($s->getch());
     $s = new StringScanner("¢", "utf-8");
     $this->assertEquals("¢", $s->getch());
     $this->assertNull($s->getch());
 }