PHP generated cool four character verification code PHP SMS Verification Code software PHP SMS Verification Code platform PHP SMS Verification Code Pass

Source: Internet
Author: User
Tags learn php learn php programming php sms verification
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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