php 文本转HTML与获取IP函数

php 文本转HTML与获取IP函数

/**
 * 文本转HTML
 *
 * @param string $txt;
 * return string;
 */
function Text2Html($txt){
 $txt = str_replace("  ","　",$txt);
 $txt = str_replace("<","&lt;",$txt);
 $txt = str_replace(">","&gt;",$txt);
 $txt = preg_replace("/[rn]{1,}/isU","<br/>rn",$txt);
 return $txt;
}

/**
 * 获得IP
 * return string;
 */
function GetIP(){
 if(!empty($_SERVER["HTTP_CLIENT_IP"])) { $cip = $_SERVER["HTTP_CLIENT_IP"]; }
 else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) { $cip = $_SERVER["HTTP_X_FORWARDED_FOR"]; }
 else if(!empty($_SERVER["REMOTE_ADDR"])) { $cip = $_SERVER["REMOTE_ADDR"]; }
 else $cip = "";
 preg_match("/[d.]{7,15}/", $cip, $cips);
 $cip = $cips[0] ? $cips[0] : 'unknown';
 unset($cips);
 return $cip;
}

计算字符串的长度（汉字按照两个字符计算）

 *
 * @param   string      $str        字符串
 *
 * @return  int
 */
function str_len($str)
{
    $length = strlen(preg_replace('/[x00-x7F]/', '', $str));

    if ($length)
    {
        return strlen($str) - $length + intval($length / 3) * 2;
    }
    else
    {
        return strlen($str);
    }
}

php ubb代码转换函数

<?php
function ubb($string) {
  $searcharray['bbcode_regexp'] = array(
   "/s*[quote][nr]*(.+?)[nr]*[/quote]s*/is",
   "/([box=(#[0-9A-F]{6}|[a-z]+)])[nr]*(.+?)[nr]*([/box])/is",
   "/[url]s*(www.|https?://|ftp://|gopher://|news://|telnet://|rtsp://|mms://){1}([^["']+?)s*[/url]/ie",
   "/[url=www.([^["']+?)](.+?)[/url]/is",
   "/[url=(https?|ftp|gopher|news|telnet|rtsp|mms){1}://([^["']+?)](.+?)[/url]/is",
   "/[email]s*([A-Za-z0-9-_.]+)@([A-Za-z0-9-_]+[.][A-Za-z0-9-_.]+)s*[/email]/i",
   "/[email=([A-Za-z0-9-_.]+)@([A-Za-z0-9-_]+[.][A-Za-z0-9-_.]+)](.+?)[/email]/is",
   "/[color=([^[]+?)]/i",
   "/[size=([^[]+?)]/i",
   "/[font=([^[]+?)]/i",
   "/[align=([^[]+?)]/i",
   "/[center]/i",
   "/[swf]s*([^[]+?)s*[/swf]/ies",
   "/[img]s*([^[]+?)s*[/img]/ies",
   "/[img=(d{1,3})[x|,](d{1,3})]s*([^[]+?)s*[/img]/ies"
  );
  $replacearray['bbcode_regexp'] = array(
   "<br><br><center><table border="0" width="90%" cellspacing="0" cellpadding="0"><tr><td>&nbsp;&nbsp;Quote:</td></tr><tr><td><table border="0" width="100%" cellspacing="1" cellpadding="10" bgcolor="".BORDERCOLOR.""><tr><td width="100%" bgcolor="".ALTBG2."" style="word-break:break-all">\1</td></tr></table></td></tr></table></center><br>",
   "<blockquote style="background-color: \2 ;"><span class="bold">$title</span>\3</blockquote>",
   "cuturl('\1\2')",
   "<a href="http://www.\1" target="_blank">\2</a>",
   "<a href="\1://\2" target="_blank">\3</a>",
   "<a href="mailto:\1@\2">\1@\2</a>",
   "<a href="mailto:\1@\2">\3</a>",
   "<font color="\1">",
   "<font size="\1">",
   "<font face="\1">",
   "<p align="\1">",
   "<p align="center">",
   "bbcodeurl('\1', ' <img src="images/flash.gif" align="absmiddle"> <a href="%s" target="_blank">Flash: %s</a> ')",
   "bbcodeurl('\1', '<img src="%s" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window';}" onmouseover="if(this.resized) this.style.cursor='hand';" onclick="if(this.resized) {window.open('%s');}">')",
   "bbcodeurl('\3', '<img width="\1" height="\2" src="%s" border="0">')"
  );

  $searcharray['bbcode_str'] = array(
   '[/color]', '[/size]', '[/font]', '[/align]', '[b]', '[/b]',
   '[i]', '[/i]', '[u]', '[/u]', '[list]', '[list=1]', '[list=a]',
   '[list=A]', '[*]', '[/list]','[/center]'
  );

  $replacearray['bbcode_str'] = array(
   '</font>', '</font>', '</font>', '</p>', '<b>', '</b>', '<i>',
   '</i>', '<u>', '</u>', '<ul>', '<ol type=1>', '<ol type=a>',
   '<ol type=A>', '<li>', '</ul></ol>','</p>'
  );                 
  $string = str_replace($searcharray['bbcode_str'], $replacearray['bbcode_str'], preg_replace($searcharray['bbcode_regexp'], $replacearray['bbcode_regexp'], $string));

                return $string;
}

function bbcodeurl($url, $tags) {
 if(!preg_match("/<.+?>/s",$url)) {
  if(!in_array(strtolower(substr($url, 0, 6)), array('http:/', 'ftp://', 'rtsp:/', 'mms://'))) {
   $url = 'http://'.$url;
  }
  return str_replace('submit', '', sprintf($tags, $url, $url));
 } else {
  return '&nbsp;'.$url;
 }
}

function cuturl($url) {
 $length = 65;
 $urllink = "<a href="".(substr(strtolower($url), 0, 4) == 'www.' ? "http://$url" : $url).'" target="_blank">';
 if(strlen($url) > $length) {
  $url = substr($url, 0, intval($length * 0.5)).' ... '.substr($url, - intval($length * 0.3));
 }
 $urllink .= $url.'</a>';
 return $urllink;
}
?>

php 生成验证码源码

session_start();

$enablegd = 1;
$funcs = array('imagecreatetruecolor','imagecolorallocate','imagefill','imagestring','imageline','imagerotate','imagedestroy','imagecolorallocatealpha','imageellipse','imagepng');
foreach($funcs as $func)
{
 if(!function_exists($func))
 {
  $enablegd = 0;
  break;
 }
}

ob_clean();

if($enablegd)
{
 //create captcha
 $consts = 'cdfgkmnpqrstwxyz23456';
 $vowels = 'aek23456789';
 for ($x = 0; $x < 6; $x++)
 {
  $const[$x] = substr($consts, mt_rand(0,strlen($consts)-1),1);
  $vow[$x] = substr($vowels, mt_rand(0,strlen($vowels)-1),1);
 }
 $radomstring = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4];
 $_SESSION['checkcode'] = $string = substr($radomstring,0,4); //only display 4 str
 //set up image, the first number is the width and the second is the height
 $imageX = strlen($radomstring)*8; //the image width
 $imageY = 20;      //the image height
 $im = imagecreatetruecolor($imageX,$imageY);

 //creates two variables to store color
 $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250));
 $foregroundArr = array(imagecolorallocate($im, rand(0, 20), rand(0, 20), rand(0, 20)),
         imagecolorallocate($im, rand(0, 20), rand(0, 10), rand(245, 255)),
         imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(0, 10)),
         imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(245, 255)));
 $foreground2 = imagecolorallocatealpha($im, rand(20, 100), rand(20, 100), rand(20, 100),80);
 $middleground = imagecolorallocate($im, rand(200, 160), rand(200, 160), rand(200, 160));
 $middleground2 = imagecolorallocatealpha($im, rand(180, 140), rand(180, 140), rand(180, 140),80);

 //fill image with bgcolor
 imagefill($im, 0, 0, imagecolorallocate($im, 250, 253, 254));
 //writes string
 imagettftext($im, 12, rand(30, -30), 5, rand(14, 16), $foregroundArr[rand(0,3)], PHPCMS_ROOT.'include/fonts/ALGER.TTF', $string[0]);
 imagettftext($im, 12, rand(50, -50), 20, rand(14, 16), $foregroundArr[rand(0,3)], PHPCMS_ROOT.'include/fonts/ARIALNI.TTF', $string[1]);
 imagettftext($im, 12, rand(50, -50), 35, rand(14, 16), $foregroundArr[rand(0,3)], PHPCMS_ROOT.'include/fonts/ALGER.TTF', $string[2]);
 imagettftext($im, 12, rand(30, -30), 50, rand(14, 16), $foregroundArr[rand(0,3)], PHPCMS_ROOT.'include/fonts/arial.ttf', $string[3]);
 
 //strikethrough

 $border = imagecolorallocate($im, 133, 153, 193);
 //imagefilledrectangle($aimg, 0, 0, $x_size - 1, $y_size - 1, $back);
 imagerectangle($im, 0, 0, $imageX - 1, $imageY - 1, $border);

 $pointcol = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
 for ($i=0;$i<80;$i++)
 {
  imagesetpixel($im,rand(2,$imageX-2),rand(2,$imageX-2),$pointcol);
 }
 //random shapes
 for ($x=0; $x<9;$x++)
 {
  if(mt_rand(0,$x)%2==0)
  {
   imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999));
   imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground2);
  }
  else
  {
   imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999));
   imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground);
  }
 }
 //output to browser
    header("content-type:image/pngrn");
 imagepng($im);
 imagedestroy($im);
}
else
{
 $files = glob(PHPCMS_ROOT.'images/checkcode/*.jpg');
 if(!is_array($files)) exit($LANG['please_check_dir_images_checkcode']);

 $checkcodefile = $files[rand(0, count($files)-1)];
 $_SESSION['checkcode'] = substr(basename($checkcodefile), 0, 4);

 header("content-type:image/jpegrn");
 include $checkcodefile;
}

php简单文件下载过滤判断函数

if(strpos($fileurl, ':/'))//远程文件
{
 header("Location: $fileurl");
}
else//本地文件
{
 if($d == 0)
 {
  header("Location: ".SITE_URL.$fileurl);
 }
 else
 {
  $fileurl = file_exists($fileurl) ? stripslashes($fileurl) : PHPCMS_ROOT.$fileurl;//此处可能为物理路径
  $filename = basename($fileurl);
  if(preg_match("/^([sS]*?)([x81-xfe][x40-xfe])([sS]*?)/", $fileurl))//处理中文文件
  {
   $filename = str_replace(array("%5C", "%2F", "%3A"), array("\", "/", ":"), urlencode($fileurl));
   $filename = urldecode(basename($filename));
  }
  file_down($fileurl, $filename);
 }
}