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基于php驗(yàn)證碼函數(shù)的使用示例有哪些

時(shí)間:2024-09-14 17:44:20 PHP 我要投稿
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基于php驗(yàn)證碼函數(shù)的使用示例有哪些

  復(fù)制代碼 代碼如下:

  function _code($_code_length = 4, $_width = 75, $_height = 25){

  for($i=0;$i<$_code_length;$i++){

  $_nmsg .= dechex(mt_rand(0,15));

  }

  $_SESSION["code"] = $_nmsg;

  $_img = imagecreatetruecolor($_width, $_height);

  $_white = imagecolorallocate($_img, 250, 250, 250);

  imagefill($_img, 0, 0, $_white);

  $_gray = imagecolorallocate($_img, 196, 196, 196);

  imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray);

  for ($i=0; $i < 6; $i++) {

  $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));

  imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color);

  }

  for ($i=0; $i < 50; $i++) {

  $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));

  imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color);

  }

  for ($i=0; $i < $_code_length ; $i++) {

  $_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102));

  imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["code"][$i], $_md_color);

  }

  header("Content-Type:image/png");

  imagepng($_img);

  imagedestroy($_img);

  }

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