public function testExplode()
{
$t = new \Test\Strings();
$pizza = "piece1,piece2,piece3,piece4,piece5,piece6";
$ar1 = $t->testExplode(',', $pizza);
$ar2 = $t->testExplodeStr($pizza);
$this->assertSame($ar1[0], 'piece1');
$this->assertSame($ar1[2], 'piece3');
$this->assertSame($ar2[0], 'piece1');
$this->assertSame($ar2[2], 'piece3');
$ar3 = $t->testExplodeLimit($pizza, 3);
$this->assertCount(3, $ar3);
$this->assertSame($ar3[2], 'piece3,piece4,piece5,piece6');
}