PHP Generate verification Code and Verification Code Verification complete Example _php tutorial

This article to share a self-used verification code instance, from the generation of picture verification code to the use of examples of using verification code, there are students who need to learn to refer to this article Oh.

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The verifycode.php file code is as follows

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/* Image verification Code Powered by Kason */ Session_Start (); $num =4;//number of verification codes $width =80;//Verification Code width $height =20;//Verification Code height $code = "; for ($i =0; $i < $num; $i + +)//Generate Verification code { Switch (rand (0,2)) { Case 0: $code [$i]=CHR (rand (48,57)); break;//number Case 1: $code [$i]=CHR (rand (65,90)); break;//Capital Letter Case 2: $code [$i]=CHR (rand (97,122)); break;//Small Letter } } $_session["Verifycode"]= $code; $image =imagecreate ($width, $height); Imagecolorallocate ($image, 255,255,255); for ($i =0; $i <80; $i + +)//Generate interference pixels { $dis _color=imagecolorallocate ($image, Rand (0,2555), Rand (0,255), Rand (0,255)); Imagesetpixel ($image, rand (1, $width), rand (1, $height), $dis _color); } for ($i =0; $i < $num; $i + +)//print character to image { $char _color=imagecolorallocate ($image, Rand (0,2555), Rand (0,255), Rand (0,255)); Imagechar ($image, Max, ($width/$num) * $i, Rand (0,5), $code [$i], $char _color); } Header ("Content-type:image/png"); Imagepng ($image);//output image to browser Imagedestroy ($image);//Release resources ?>

checkcode.php files are as follows

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Ini_set (' display_errors ', ' Off '); Session_Start (); if ((Strtoupper ($_post["code")) = = Strtoupper (($_session["Verifycode"])) { Print ("Verification code is correct,"); }else{ Print ("Captcha error,"); } echo "submitted Captcha:". Strtoupper ($_post["code"]). ", correct captcha:". Strtoupper ($_session["Verifycode"]); ?>

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