PHP generates cool four character verification code, PHP generates cool verification Code _php tutorial

PHP generates cool four character verification code, PHP generates cool verification code

The example of this article for everyone to share the code of PHP generated verification codes, for your reference, the specific content as follows

<?php$im=imagecreate (200,100);//Generate Canvas Imagecolorallocate ($im, 0,0,0);//background-color $white=imagecolorallocate ($im, Rand ( 0,255), Rand (0,255), Rand (0,255));//Generate Random color for ($i =0; $i <9; $i + +) {Imageline ($im, Rand (0,200), Rand (0,100), Rand ( 0,200), Rand (0,100), $white);//Generate Interference line elements}for ($i =0; $i <150; $i + +) {Imagesetpixel ($im, Rand (0,200), Rand (0,100), $ white);//Generate a disturbance point element}for ($i =0, $str = "; $i <4; $i + +)//To get four characters {switch (rand (1,3)) {case  ' 1 ':  $ch =rand (0,9);  break;   Case ' 2 ':  $ch =sprintf ('%c ', rand (97,122));  break;  Case ' 3 ':  $ch =sprintf ('%c ', rand (65,90));  Break }  $str. = $ch;} Imagettftext ($im, 32,rand (0,15), 55,70, $white, ' C.TTC ', $str);//output string header on canvas ("Content-type:image/jpeg"); Imagejpeg ($im); Imagedestroy ($im);? >

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