PHP method to get text display dot matrix width and height

This article mainly introduces the method of PHP to obtain the width and height of a text display lattice, involving the usage of the imagettfbbox function and the skills of PHP operating ttf text. It has certain reference value. Friends in need can refer to it

The example in this article describes how PHP obtains the width and height of a text display dot matrix. The details are as follows:

define("F_SIZE", 8);
define("F_FONT", "arial.ttf");
function get_bbox($text){
  return imagettfbbox(F_SIZE, 0, F_FONT, $text);
}
function text_height ($text) {
  $box = get_bbox($text);
  $height = $box[3] - $box[5];
  return $height;
}
function text_width ($text) {
  $box = get_bbox($text);
  $width = $box[4] - $box[6];
  return $width;
}

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