html - Increasing font size in PHP code and align text in center of captcha image -


i have following php code generates , gives me captcha. captcha code lies on top left corner of 180x60 background image (fuzzy type captcha background image). , 12px in size. want bring exect center of image font size of 18px or more (adjustable). but, not sure how confusing edit code this.

here code.

<?php     session_start();     $ranstr = md5(microtime());     $ranstr = substr($ranstr, 0, 6);     $_session['cap_code'] = $ranstr;     $newimage = imagecreatefromjpeg("images/cap_bg.jpg");     $txtcolor = imagecolorallocate($newimage, 0, 0, 0);     imagestring($newimage, 5, 5, 5, $ranstr, $txtcolor);     header("content-type: image/jpeg");     imagejpeg($newimage); ?> 

any appreciated. thank you!


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