檢查在同一頁上的驗證碼在php

Question

我從用戶輸入的形式提交調用一個JavaScript函數，並檢查是否強制條目填充或不。如果它轉到另一個文件。現在我正在檢查另一個文件中的驗證碼。我可以在同一頁上這麼做嗎？ 預先感謝您！

Answer 1

一個簡單的PHP腳本CAPTCHA

<?php 

session_start(); 
include("captcha.php"); 
$_SESSION['captcha'] = captcha(); 

echo '<img src="' . $_SESSION['captcha']['image_src'] . '" alt="CAPTCHA" />'; 

?> 

更多 - http://www.abeautifulsite.net/blog/2011/01/a-simple-php-captcha-script/

Answer 2

驗證碼生成代碼

captcha.php：

$string = ''; 
for ($i = 0; $i < 5; $i++) // 5 -is considered here as the length of string 
    $string .= chr(rand(97, 122)); 
$_SESSION['captcha']=$string; // stores to session 
$image = imagecreatetruecolor(110, 28); 
$fontArray[0]="a4.ttf";$fontArray[1]="a5.ttf";$fontArray[2]="a1.ttf";$fontArray[3]="a4.ttf"; 
// just a font array for diff look Note : try ttf 
$font = 'font/'.$fontArray[rand()%3]; // selecting random font 
$color = imagecolorallocate($image, 255, 255, 255);// color 
$background = imagecolorallocate($image, 0, 0, 0); // background color 
$grey = imagecolorallocate($image, 180, 180, 180);//shadow color 
imagefilledrectangle($image,0,0,399,99,$background); 
imagettftext($image, 18, 0, 11, 23, $grey, $font, $string);//shadow of the text 
imagettftext($image, 18, 0, 10, 22, $color, $font, $string);// text 
//Actual function array imagettftext (resource $image , float $size , float $angle , int $x , int $y , int $color , string $fontfile , string $text) 
header("Content-type: image/png"); 
imagepng($image); 

然後用這個作爲顯示頁面圖像。像 -

<img id="capcaptcha" src="captcha.php" /> 
<a onclick="new_capcaptcha()">Click here to reload captha</a> 

jQuery的

function new_capcaptcha(){ 
    $('#capcaptcha').attr('src',''); 
    $('#capcaptcha').attr('src','captcha.php?rand='+Math.random()); 
    // to avoid browser cache passed 'rand' 
    } 

進行驗證，你可以使用以前存儲的會話變量$ _SESSION [ '驗證碼']

希望這將有助於充分

Answer 3

圖形驗證碼生成器 -

<?php 
session_start(); 
//Settings: You can customize the captcha here 
$image_width = 200; 
$image_height = 60; 
$characters_on_image = 5; 
$font = './monofont.ttf'; 

//The characters that can be used in the CAPTCHA code. 
//avoid confusing characters (l 1 and i for example) 
$possible_letters = '23456789bcdfghjkmnpqrstvwxyz'; 
$random_dots = 140; 
$random_lines = 5; 
$captcha_text_color="0x142864"; 
$captcha_noice_color = "0x142864"; 

$code = ''; 


$i = 0; 
while ($i < $characters_on_image) { 
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1); 
$i++; 
} 


$font_size = $image_height * 0.75; 
$image = @imagecreate($image_width, $image_height); 


/* setting the background, text and noise colours here */ 
$background_color = imagecolorallocate($image, 255, 255, 255); 

$arr_text_color = hexrgb($captcha_text_color); 
$text_color = imagecolorallocate($image, $arr_text_color['red'], 
     $arr_text_color['green'], $arr_text_color['blue']); 

$arr_noice_color = hexrgb($captcha_noice_color); 
$image_noise_color = imagecolorallocate($image, $arr_noice_color['red'], 
     $arr_noice_color['green'], $arr_noice_color['blue']); 


/* generating the dots randomly in background */ 
for($i=0; $i<$random_dots; $i++) { 
imagefilledellipse($image, mt_rand(0,$image_width), 
mt_rand(0,$image_height), 2, 3, $image_noise_color); 
} 


/* generating lines randomly in background of image */ 
for($i=0; $i<$random_lines; $i++) { 
imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height), 
mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color); 
} 


/* create a text box and add 6 letters code in it */ 
$textbox = imagettfbbox($font_size, 0, $font, $code); 
$x = ($image_width - $textbox[4])/2; 
$y = ($image_height - $textbox[5])/2; 
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code); 


/* Show captcha image in the page html page */ 
header('Content-Type: image/jpeg');// defining the image type to be shown in browser widow 
imagejpeg($image);//showing the image 
imagedestroy($image);//destroying the image instance 
$_SESSION['6_letters_code_1'] = $code; 

function hexrgb ($hexstr) 
{ 
    $int = hexdec($hexstr); 

    return array("red" => 0xFF & ($int >> 0x10), 
       "green" => 0xFF & ($int >> 0x8), 
       "blue" => 0xFF & $int); 
} 
?> 

您也可以從www.uandblog.com獲得詳細信息（http://www.uandblog.com/How-to-Create-Captcha-Code-using-PHP）