How to calculate the font size of the aspect in the GD function library similar to the Imagettftext imagestring function settings??

怎么计算 imagestring($source,$font_size,$x,$y,$string,$color) 中$font_size（除去预置的1-5）设置的字体大小所对应的像素值？？这边的$font_size（除去预置的1-5）设置的字体大小的单位是什么？？ 即若是$font_size=15，那是指字体大小为15px？？

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怎么计算 imagestring($source,$font_size,$x,$y,$string,$color) 中$font_size（除去预置的1-5）设置的字体大小所对应的像素值？？这边的$font_size（除去预置的1-5）设置的字体大小的单位是什么？？ 即若是$font_size=15，那是指字体大小为15px？？

You can use imagettfbbox functions to calculate the height width of the string for a TTF font, and use it imagettftext to write images

http://php.net/manual/zh/function.imagettfbbox.php
http://php.net/manual/zh/function.imagettftext.php

Add:
You mentioned the imagestring function, the second parameter is not fontsize what font , but is GD prefabricated 5 font, size you can not modify , if you want to use the extra font, need to use the imageloadfont function to load, loading is not TTF font, so your period The effect of looking at these two functions is not possible.

http://php.net/manual/zh/function.imagestring.php
http://php.net/manual/zh/function.imageloadfont.php

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