在图像上为PHP写自定义文本

I would like to add custom text on shirt and other device. but i dont know where to tackle the custom aspect in the area of adding text and logo to the shirt.

One of the easiest libraries for working with images is Intervention. (http://image.intervention.io/api/text)

From their website documentation:

// create Image from file
$img = Image::make('public/foo.jpg');

// write text
$img->text('The quick brown fox jumps over the lazy dog.');

// write text at position
$img->text('The quick brown fox jumps over the lazy dog.', 120, 100);

// use callback to define details
$img->text('foo', 0, 0, function($font) {
  $font->file('foo/bar.ttf');
  $font->size(24);
  $font->color('#fdf6e3');
  $font->align('center');
  $font->valign('top');
  $font->angle(45);
});

// draw transparent text
$img->text('foo', 0, 0, function($font) {
  $font->color(array(255, 255, 255, 0.5))
});