如何制作字母间距？

Question

问题：如果行大小超过100px，我该如何转移字母？同时保留字母间距？

我不知道怎么做，如果行宽$ width提议不适合，那么它应该带一个保持字母间距的新行。请告诉我

我的代码字母间距：

$width = 100; //max 100px in line
$_letter_int = 10; // size letter spacing 10px

$body = 'My name is IxtWall noobs';

$canvas = new Imagick();
$draw = new ImagickDraw();
$color = new ImagickPixel('#00000');

$draw->setFont('Arial.ttf');
$draw->setFontSize(23);
$draw->setFillColor($color);
$draw->setTextAntialias(true);

$left_int = 0;

$global_data = $canvas->queryFontMetrics($draw, $body);
$height = $global_data['textHeight'];

foreach( str_split($body) as $val )
{
    $data = $canvas->queryFontMetrics($draw, $val);

    $draw->annotation($left_int, $global_data['ascender'], $val);
    $left_int += $_letter_int + round($data['boundingBox']['x2']);
}

$canvas->newImage($width, $height, 'none');
$canvas->drawImage($draw);
$canvas->setImageFormat('png');

header('Content-Type: image/png');
echo $canvas->getImageBlob();