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<?php
Verification Code
if (Isset ($_post["Authcode")) {
Session_Start ();
if (strtolower($_POST["authcode"]) == $_SESSION["authcode"]) { echo "<font color=‘#0000cc‘>输入正确</font>"; } else { echo "<font color=‘#cc0000‘>输入错误</font>"; } exit();}
?>
<! DOCTYPE html>
<meta charset= "Utf-8"/>
<title> Confirm Verification Code </title>
<script type= "Text/javascript" ></script>
<body>
<form action= "test.php" method= "POST" >
<p> captcha Image: "width=" 100px "height=" </p>
<a href= "javascript:void (0)" onclick= "document.getElementById (' captcha_img '). src= ' 1.php?r= ' +Math.random ()" > Change one? </a>
<p> Please enter the contents of the Picture: <input type= "text" name= "Authcode" value= "/></p>
<p><input type= "Submit" value= "commit" style= "padding:6px 20px";></p>
</form>
</body>
Back-end PHP processing generate verification Code
<?php
Session_Start ();
Header ("Content-type:image/png");
Generate white Basemap $image = imagecreatetruecolor (0); $bgcolor = Imagecolorallocate ($image, 255, 255, 255); Imagefill ($image , 0, $bgcolor);//Generate 4 colored random characters/*1 on a white basemap. Generate 4 digits for ($i =0; $i <4; $i + +) {$fontsize = 6; $fontcolor = Imagecolorallocate ($image, rand (0, +), rand (0, +), rand (0, 120)); $fontcontent = rand (0, 9); $x = ($i *100/4) + rand (5, 10); $y = rand (5, 10); Imagestring ($image, $fontsize, $x, $y, $fontcontent, $fontcolor);} *///2. Generate random alphanumeric $captch_code = "";//The generated verification code is stored in the variable for ($i =0; $i <4; $i + +) {$fontsize = 6; $fontcolor = Imagecolorallocate ($image, rand (0, +), rand (0, +), rand (0, 120)); Random interception of alphanumeric $data = "abcdefghijkmnopqrstuvwxyz23456789"; $fontcontent = substr ($data, Rand (0,strlen ($DATA)), 1); $captch _code.= $fontcontent;//Append to verification code to store $x = ($i *100/4) + rand (5, 10); $y = rand (5, 10); Imagestring ($image, $fontsize, $x, $y, $fontcontent, $fontcolor);} $_session["Authcode"] = $captch _code;//Save to SESSION//generate random points on white basemap (interference Element) for ($i =0; $i <200; $i + +){$pointcolor = Imagecolorallocate ($image, Rand (), Rand (50, 200)); Imagesetpixel ($image, rand (1, $), rand (1,), $pointcolor);} Generates a random line (interference element) for ($i =0; $i <3; $i + +) on a white basemap {$linecolor = Imagecolorallocate ($image, Rand (UP), Rand), Rand ( 80, 220)); Imageline ($image, rand (1), Rand (1, $), rand (1,), rand (1), $linecolor);} Imagepng ($image); Imagedestroy ($image);?> "
PHP JS CSS Session Implementation Verification code function
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