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                        /后端開發(fā)
                        
                            /PHP
                        
                        /PHP實現(xiàn)驗證碼制作

由于沒有源碼下載,我把我寫的貼在此處,希望不清楚的小伙伴參考一下,如果有錯誤還望指正,Thx

captcha.php

<?php
????????session_start();
????????$image?=?imagecreatetruecolor(100,30);
????????$bgcolor?=?imagecolorallocate($image,255,255,255);
????????imagefill($image,0,0,$bgcolor);

????????/*for($i=0;$i<4;$i++){
????????????$fontsize??=?6;
????????????$fontcolor?=?imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
????????????$fontcontent?=?rand(0,9);

????????????$x?=?($i*100/4)?+?rand(5,10);
????????????$y?=?rand(5,10);
????????????imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);;
????????}*/
????????????$captch_code?=?'';
????????????for($i=0;$i<4;$i++){
????????????????$fontsize?=?6;
????????????????$fontcolor?=?imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));

????????????????$data?=?'abcdefghigklmnopqrstuvwxyz1234567890';
????????????????$fontcontent?=?substr($data,rand(0,strlen($data))-1,1);
????????????????$captch_code.=$fontcontent;
????????????????$x?=?($i*100/4)?+?rand(5,10);
????????????????$y?=?rand(5,10);
????????????????imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
????????????}
????????$_SESSION['authcode']?=?$captch_code;
????????for($i=0;?$i<200;?$i++){
????????????$pointcolor?=?imagecolorallocate($image,?rand(50,200),rand(50,200),rand(50,200));
????????????imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
????????}

????????for($i=0;$i<3;?$i++){
????????????$linecolor?=?imagecolorallocate($image,rand(80,220),rand(80,220),rand(80,220));
????????????imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);
????????}
????????header('content-type:image/png');
????????imagepng($image);
????????imagedestroy($image);

form.php

<?php
?header("Content-type:text/html;charset=utf-8");
?if(isset($_REQUEST['authcode'])){
?session_start();
?if(strtolower($_REQUEST['authcode'])==$_SESSION['authcode']){
?echo?'<p?color="#0000CC">輸入正確</p>';
?}else{
?echo?'<p?color="#CC0000">輸入錯誤</p>';
?}
?exit;
?}
?>
<!doctype?html>
<html?lang="en">
<head>
????<meta?charset="UTF-8">
????<title>確認(rèn)驗證碼</title>
</head>
<body>
<form?method="post"?action="./form.php">
????<p>驗證圖片:?<img?src="./captcha.php?r=<?php?echo?rand();?>"?border="1"?width="100"></p>
????<p>請輸入圖片中的內(nèi)容:
????????<input?type="text"?name="authcode"?value=""/>
????</p>
????<p><input?type="submit"?value="提交"?style="padding:?6px?20px;"/></p>
</form>
</body>
</html>