PHP generates a code program with interference _php tutorial

This paper introduces a high security verification generator, which can take interference lines and other content, which can effectively prevent users from using the program to identify the difficulty of verification code.

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/* * Created on 2011-3-11 * Programmer:xiaoyao, qq:1045195056 Validation by judging the value of the input value and $_session[' Check_pic '] */ Session_Start (); function Randascii ($number) {//$number produce numbers and letters $arr =array (' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' h ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' w ', ' V ', ' u ', ' x ', ' y ', ' z '); for ($i =1; $i <= $number; $i + +) { $rand = $rand. $arr [Rand (0,35)]; } return $rand; } $rand =randascii (4); $_session[' check_pic ']= $rand;//A randomly generated four-digit assignment SESSION for validation. $x = 80; $y = 24; $im =imagecreatetruecolor ($x, $y);//Create Picture $BG =imagecolorallocate ($im, 255,255,255);//Set color background Imagefill ($im, 0,0, $BG); $wh =imagecolorallocate ($im, 255,255,0); $grey =imagecolorallocate ($im, 128,128,128); $yellow =imagecolorallocate ($im, 255,255,0); $red =imagecolorallocate ($im, 0,255,0); $FOREGROUNDARR = Array (imagecolorallocate ($im, rand (0,), rand (0,), rand (0, 20)), Imagecolorallocate ($im, rand (0,), rand (0, 245, 255)), Imagecolorallocate ($im, rand (245, 255), rand (0,), rand (0, 10)), Imagecolorallocate ($im, rand (245, 255), rand (0,), rand (245, 255)) );//Word color array Draw Border $border = Imagecolorallocate ($im, 133, 153, 193); Imagerectangle ($im, 0, 0, $x-1, $y-1, $border); for ($i =0; $i <10; $i + +) {//Draw interference lines, 10 strips Imageline ($im, Rand (0,60), 2,rand (0,60), $yellow); } for ($j =0; $j <100; $j + +) { Imagesetpixel ($im, Rand ()%76,rand ()%20, $red); } Imagestring ($im, 6,15,8, $rand, $WH);//font size 1-5 Imagettftext ($im, 14,rand ( -30), 5, Rand (All), $foregroundArr [Rand (0,3)], ' C:windowsfontsarial.ttf ', $rand [0]); Imagettftext ($im, 14,rand ( -50), Rand (at), $foregroundArr [Rand (0,3)], ' C:windowsfontsarial.ttf ', $rand [1]; Imagettftext ($im, 14,rand ( -50), A, rand (at), $foregroundArr [Rand (0,3)], ' C:windowsfontsarial.ttf ', $rand [2]; Imagettftext ($im, 14,rand ( -30), 0,3, Rand, $FOREGROUNDARR [rand ()], ' C:windowsfontsarial.ttf ', $rand [3]); Header ("Content-type:image/jpeg");//Output picture Imagejpeg ($im); Imagedestroy ($im); ?>

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/* * Created on 2011-3-11 * Programmer:xiaoyao, qq:1045195056 Validation by judging the value of the input value and $_session[' Check_pic '] */ Session_Start ();//Open session if (Isset ($_post[' check ')) { if ($_post[' check ') { if ($_post[' check ']==$_session[' Check_pic ')) { echo "Captcha is correct". $_session[' Check_pic '; } Else { echo "Captcha error". $_session[' Check_pic '; } } } ?>

http://www.bkjia.com/PHPjc/629697.html www.bkjia.com true http://www.bkjia.com/PHPjc/629697.html techarticle This paper introduces a high security verification generator, which can take interference lines and other content, which can effectively prevent users from using the program to identify the difficulty of verification code. Code to copy code as follows ...

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