php - Unable to horizontally center 'm' with GD2 -

my goal draw horizontally centered m. therefore calculate width of letter, substract value total width , divide 2. result should distance left (or equally right).

however, 'm' misplaced. noticed fonts may not trigger problematic behavior. note script correctly works other latin characters.

arial:

bitstream vera sans:

<?php  $totalwidth = 100; $totalheight = 100; $font = 'arial.ttf';  $img = imagecreatetruecolor($totalwidth, $totalheight); $red = imagecolorallocate($img, 255, 0, 0);  $fontsize = 100; $bbox = imagettfbbox($fontsize, 0, $font, 'm'); $width = max($bbox[2], $bbox[4]) - max($bbox[0], $bbox[6]);  $centeredx = ($totalwidth - $width) / 2;  imagettftext($img, 100, 0, $centeredx, 100, $red, $font, 'm'); imagepng($img, 'testcase.png'); imagedestroy($img); 

there small space left of each letter, , different each letter. on php.net wrote solution this: http://www.php.net/manual/en/function.imagettfbbox.php#97357

you need adjust code little bit.

$totalwidth = 100; $totalheight = 100; $font = 'arial.ttf';  // change letter see different letters $letter = "m";  $img = imagecreatetruecolor($totalwidth, $totalheight); $red = imagecolorallocate($img, 255, 0, 0);  $fontsize = 100; $bbox = calculatetextbox($fontsize, 0, $font, $letter);  $centeredx = (($totalwidth - $bbox['width']) / 2);  // here left coordinate subtracted (+ negative value) centeredx imagettftext($img, 100, 0, $centeredx + $bbox['left'], 100, $red, $font, $letter);  header('content-type: image/png'); imagepng($img); imagedestroy($img);