PHP Manual: Get font height

int imagefontheight(GdFontint $font)

Returns the pixel height of a character in the specified font.

font: Can be 1, 2, 3, 4, 5 for built-in fonts in latin2 encoding (where higher numbers corresponding to larger fonts) or GdFont instance, returned by imageloadfont.

Returns the pixel height of the font.

Version	Description
8.1.0	The `font` parameter now accepts both an GdFont instance and an int; previously only int was accepted.

Example #1 Using imagefontheight on built-in fonts

<?php
echo 'Font height: ' . imagefontheight(4);
?>

The above example will output something similar to:

Font height: 16

Example #2 Using imagefontheight together with imageloadfont

<?php
// Load a .gdf font
$font = imageloadfont('anonymous.gdf');

echo 'Font height: ' . imagefontheight($font);
?>

The above example will output something similar to:

Font height: 43

imagefontheight