PHP繪圖函數產生圖片驗證碼

最後更新：2016-07-29 來源：互聯網

上載者：User

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PHP繪圖函數產生圖片驗證碼

// Set some important CAPTCHA constants  define('CAPTCHA_NUMCHARS', 6);  // number of characters in pass-phrase  define('CAPTCHA_WIDTH', 100);   // width of image  define('CAPTCHA_HEIGHT', 25);   // height of image// Generate the random pass-phrase$pass_phrase = "";  for ($i = 0; $i < CAPTCHA_NUMCHARS; $i++) {    $pass_phrase .= chr(rand(97, 122));  }  // Store the encrypted pass-phrase in a session variable$_SESSION['pass_phrase'] = SHA($pass_phrase);  // Create the image$img = imagecreatetruecolor(CAPTCHA_WIDTH, CAPTCHA_HEIGHT);  // Set a white background with black text and gray graphics$bg_color = imagecolorallocate($img, 255, 255, 255);     // white$text_color = imagecolorallocate($img, 0, 0, 0);         // black$graphic_color = imagecolorallocate($img, 64, 64, 64);   // dark gray// Fill the background  imagefilledrectangle($img, 0, 0, CAPTCHA_WIDTH, CAPTCHA_HEIGHT, $bg_color);  // Draw some random linesfor ($i = 0; $i < 5; $i++) {    imageline($img, 0, rand() % CAPTCHA_HEIGHT, CAPTCHA_WIDTH, rand() % CAPTCHA_HEIGHT, $graphic_color);  }  // Sprinkle in some random dotsfor ($i = 0; $i < 50; $i++) {    imagesetpixel($img, rand() % CAPTCHA_WIDTH, rand() % CAPTCHA_HEIGHT, $graphic_color);  }  // Draw the pass-phrase string  imagettftext($img, 18, 0, 5, CAPTCHA_HEIGHT - 5, $text_color, 'Courier New Bold.ttf', $pass_phrase);  // Output the image as a PNG using a header  header("Content-type: image/png");  imagepng($img);  // Clean up  imagedestroy($img);?>

在頁面中使用這個產生驗證碼的指令碼

  session_start();?><htmlxmlns="http://www.w3.org/1999/xhtml"xml:lang="en"lang="en"><head><metahttp-equiv="Content-Type"content="text/html; charset=utf-8" /><title>Guitar Wars - Add Your High Scoretitle><linkrel="stylesheet"type="text/css"href="style.css" />head><body><h2>Guitar Wars - Add Your High Scoreh2>require_once('appvars.php');  require_once('connectvars.php');  if (isset($_POST['submit'])) {    // Connect to the database$dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);    // Grab the score data from the POST$name = mysqli_real_escape_string($dbc, trim($_POST['name']));    $score = mysqli_real_escape_string($dbc, trim($_POST['score']));    $screenshot = mysqli_real_escape_string($dbc, trim($_FILES['screenshot']['name']));    $screenshot_type = $_FILES['screenshot']['type'];    $screenshot_size = $_FILES['screenshot']['size'];     // Check the CAPTCHA pass-phrase for verification$user_pass_phrase = SHA($_POST['verify']);    if ($_SESSION['pass_phrase'] == $user_pass_phrase) {      if (!empty($name) && is_numeric($score) && !empty($screenshot)) {        if ((($screenshot_type == 'image/gif') || ($screenshot_type == 'image/jpeg') || ($screenshot_type == 'image/pjpeg') || ($screenshot_type == 'image/png'))          && ($screenshot_size > 0) && ($screenshot_size <= GW_MAXFILESIZE)) {          if ($_FILES['screenshot']['error'] == 0) {            // Move the file to the target upload folder$target = GW_UPLOADPATH . $screenshot;            if (move_uploaded_file($_FILES['screenshot']['tmp_name'], $target)) {              // Write the data to the database$query = "INSERT INTO guitarwars (date, name, score, screenshot) VALUES (NOW(), '$name', '$score', '$screenshot')";              mysqli_query($dbc, $query);              // Confirm success with the userecho'Thanks for adding your new high score! It will be reviewed and added to the high score list as soon as possible.
';              echo'Name: ' . $name . '

       ';              echo'Score: ' . $score . '

       ';              echo' . GW_UPLOADPATH . $screenshot . '" alt="PHP繪圖函數產生圖片驗證碼" />
';              echo'<< Back to high scores
';              // Clear the score data to clear the form$name = "";              $score = "";              $screenshot = "";              mysqli_close($dbc);            }            else {              echo'Sorry, there was a problem uploading your screen shot image.
';            }          }        }        else {          echo'The screen shot must be a GIF, JPEG, or PNG image file no greater than ' . (GW_MAXFILESIZE / 1024) . ' KB in size.
';        }        // Try to delete the temporary screen shot image file        @unlink($_FILES['screenshot']['tmp_name']);      }      else {        echo'Please enter all of the information to add your high score.
';      }    }    else {      echo'Please enter the verification pass-phrase exactly as shown.
';    }  }?><hr /><formenctype="multipart/form-data"method="post"action=""><inputtype="hidden"name="MAX_FILE_SIZE"value="" /><labelfor="name">Name:label><inputtype="text"id="name"name="name"value="" /><br /><labelfor="score">Score:label><inputtype="text"id="score"name="score"value="" /><br /><labelfor="screenshot">Screen shot:label><inputtype="file"id="screenshot"name="screenshot" /><br /><labelfor="verify">Verification:label><inputtype="text"id="verify"name="verify"value="Enter the pass-phrase." /><imgsrc="captcha.php"alt="Verification pass-phrase" /><hr /><inputtype="submit"value="Add"name="submit" />form>body>html>

').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i <= lines; i++) { $numbering.append($('

').text(i)); }; $numbering.fadeIn(1700); }); });

以上就介紹了PHP繪圖函數產生圖片驗證碼，包括了方面的內容，希望對PHP教程有興趣的朋友有所協助。

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PHP繪圖函數產生圖片驗證碼

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