echo ‘<pre>‘;
print_r($_POST);//接post传值
print_r($_GET);//接get传值
print_r($_REQUEST);///接post传值或者get传值
print_r($_SERVER);
超级链接传值用的是get方法 $get,$request
<a href="ll.php?name=李四&age=20&psw=123">注册</a>
get传值在标题栏显示账号密码不安全
session 会话，只要是登陆，验证码用的比较多
1.<?php
session_start();
$_SESSION[‘user‘]=‘admin‘;
先执行admin
2.session_start();//在当前网页的第一行开始
if(!isset($_SESSION[‘user‘])){
echo ‘请去登陆‘;
}else{
echo ‘欢迎：‘.$_SESSION[‘user‘];
}
<?phpsession_start();if(isset($_POST[‘checkcode‘])){if($_POST[‘checkcode‘]==‘‘){echo ‘请填写验证码‘;}else if($_POST[‘checkcode‘]==$_SESSION[‘code‘]){echo ‘验证码输入正确‘;}else{echo ‘验证码有误‘;}}else{echo ‘no‘;}
验证验证码是否错误
<!DOCTYPE html><html><head><meta charset="utf-8"><title></title><meta name="keywords" content="关键字"><meta name="description" content="简介"><link rel="stylesheet" type="text/css" href="index.css"><script src=""></script></head><body><form action="reg.php" method="post">姓名： <input type="text" autofocus name="user"><br>密码： <input type="password" name="psw"><br>验证码：<input type="text" name="checkcode"><img src="inc/c.php"><br><input type="submit" value="提交"></form></body></html>
c.php
<?php
include ‘i.php‘;
check();
i.php
<?phpfunction check($len=4){session_start();header(‘content-type:image/png‘);$fs = [‘/a.ttf‘,‘/b.ttf‘,‘/f.ttf‘];$font = dirname(__FILE__).$fs[mt_rand(0,1)];$w = 35*$len;$h = 50;$i = imagecreatetruecolor($w,$h);$c = imagecolorallocatealpha($i,0,0,0,127);//imagecolortransparent($i,$c);//imagefill($i,0,0,$c);imagefilledrectangle($i,0,0,$w,$h,gc($i,‘ffffff‘,mt_rand(0,2)));$sss = ‘‘;for($j=0;$j<$len;$j++){$st = gs(1);$sss.=$st;imagettftext($i,mt_rand(15,25),mt_rand(-30,30),$j*35+10,mt_rand(28,38),gc($i),$font,$st);}$_SESSION[‘code‘] = $sss;imagesetthickness($i,mt_rand(2,8));for($j=0;$j<mt_rand(5,10);$j++){imagefilledarc($i,mt_rand(0,$w),mt_rand(0,$h),mt_rand(0,$w),mt_rand(0,$h),mt_rand(0,360),mt_rand(0,360),gc($i,‘rand‘,mt_rand(100,120)),IMG_ARC_NOFILL);}for($j=0;$j<10;$j++){imagettftext($i,mt_rand(10,15),mt_rand(-5,5),mt_rand(0,$w),mt_rand(0,$h),gc($i,‘rand‘,mt_rand(100,120)),$font,gs(1));}imagepng($i);imagedestroy($i);}function gs($n=4){$s = ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789‘;$t = ‘‘;for($i=0;$i<$n;$i++){$t.=substr($s,mt_rand(0,strlen($s)-1),1);}return $t;}/*** 生成缩略*/function thumb($i,$f=false,$w=220,$h=0,$fn=‘s_‘){$ii = getimagesize($i);if($ii[2]==2){if($ii[0]>$w){$src = imagecreatefromjpeg($i);$sw = $ii[0];$sh = $ii[1];$h = $h==0 ? $w/$sw*$sh : $h;//建立新的缩略图$dst = imagecreatetruecolor($w,$h);imagecopyresampled($dst,$src,0,0,0,0,$w,$h,$sw,$sh);if($f){imagejpeg($dst,$i);}else{$path = dirname($i).‘/‘;$name = $fn.substr($i,strrpos($i,‘/‘)+1);imagejpeg($dst,$path.$name);}imagedestroy($dst);imagedestroy($src);}}}/*** 功能：生成水银图标，水银图标文件在inc目录中 名称 logo.png*/function logo($i,$p=5,$f=true,$fn=‘logo_‘){$ii = getimagesize($i);if($ii[2]==2){if($ii[0]>300){$ni = imagecreatefromjpeg($i);$w = $ii[0];$h = $ii[1];//水银图标 logo.png 格式$logo = dirname(__FILE__).‘/logo.png‘;$li = imagecreatefrompng($logo);$liw = imagesx($li);$lih = imagesy($li);$x = ($w-$liw)/2;$y = ($h-$lih)/2;$pad = 35;switch($p){case 1:$x = 0+$pad;$y = 0+$pad;break;case 2:$y = 0+$pad;break;case 3:$x = $w-$liw-$pad;$y = 0+$pad;break;case 4:$x = 0+$pad;break;case 6:$x = $w-$liw-$pad;break;case 7:$x = 0+$pad;$y = $h-$lih-$pad;break;case 8:$y = $h-$lih-$pad;break;case 9:$x = $w-$liw-$pad;$y = $h-$lih-$pad;break;}imagecopy($ni,$li,$x,$y,0,0,$liw,$lih);if($f){imagejpeg($ni,$i);}else{$path = dirname($i).‘/‘;$name = $fn.substr($i,strrpos($i,‘/‘)+1);imagejpeg($ni,$path.$name);}imagedestroy($ni);imagedestroy($li);}}}function txt($i,$s=30,$t=‘版权所有‘,$c=‘rand‘,$a=0,$p=5,$f=true,$fn=‘t_‘){$font = dirname(__FILE__).‘/f.ttf‘;$ii = getimagesize($i);if($ii[2]==2){if($ii[0]>300){$ni = imagecreatefromjpeg($i);$pos = imagettfbbox($s,0,$font,$t);$pad = 30;switch($p){case 1://左上角$x = 0-$pos[0]+$pad;$y = 0-$pos[7]+$pad;break;case 2://上边 水平中央$x = ($ii[0]-$pos[2])/2;$y = 0-$pos[7]+$pad;break;case 3:$x = $ii[0]-$pos[2]-$pad;$y = 0-$pos[7]+$pad;break;case 4:$x = 0-$pos[0]+$pad;$y = ($ii[1]-$pos[6])/2;break;case 5:$x = ($ii[0]-$pos[2])/2;$y = ($ii[1]-$pos[6])/2;break;case 6:$x = $ii[0]-$pos[2]-$pad;$y = ($ii[1]-$pos[6])/2;break;case 7:$x = 0-$pos[0]+$pad;$y = $ii[1]-$pos[6]-$pad;break;case 8:$x = ($ii[0]-$pos[2])/2;$y = $ii[1]-$pos[6]-$pad;break;case 9:$x = $ii[0]-$pos[2]-$pad;$y = $ii[1]-$pos[6]-$pad;break;}imagettftext($ni,$s,0,$x,$y,gc($ni,$c,$a),$font,$t);if($f){imagejpeg($ni,$i);}else{$path = dirname($i).‘/‘;$name = $fn.substr($i,strrpos($i,‘/‘)+1);imagejpeg($ni,$path.$name);}imagedestroy($ni);}}}function gc($i,$c=‘rand‘,$a=0){$color = ‘‘;switch($c){case ‘white‘:$color = imagecolorallocatealpha($i,255,255,255,$a);break;case ‘black‘:$color = imagecolorallocatealpha($i,0,0,0,$a);break;case ‘red‘:$color = imagecolorallocatealpha($i,255,0,0,$a);break;case ‘green‘:$color = imagecolorallocatealpha($i,0,255,0,$a);break;case ‘rand‘:$color = imagecolorallocatealpha($i,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255),$a);break;default:$cc = str_split($c,2);$color = imagecolorallocatealpha($i,hexdec($cc[0]),hexdec($cc[1]),hexdec($cc[2]),$a);break;}return $color;}
时间： 2025-01-07 09:45:09