($this->left_eye_sph >= 0) ? $this->transpose_left_eye()

($this->left_eye_sph >= 0) ? $this->transpose_left_eye() : NULL;

if($this->left_eye_sph >= 0)
    $this->transpose_left_eye();

($this->left_eye_sph >= 0) ? $this->transpose_left_eye() : 0;

($this->left_eye_sph >= 0) && $this->transpose_left_eye();

$start = microtime(true);
for ($n = 1; $n < 10000000; ++$n)
    if (($n & 1) == 1)
        $odd = true;
    else
        $odd = false;
$elapsed = microtime(true) - $start;

echo "Using  if  needs $elapsed secn";

$start = microtime(true);
for ($n = 1; $n < 10000000; ++$n)
    $odd = (($n & 1) == 1) ? true : false;
$elapsed = microtime(true) - $start;

echo "Using  ?:  needs $elapsed secn";

($this->left_eye_sph >= 0) ? $this->transpose_left_eye() : 0