PHP通用代码

一个是curl的post请求函数，主要用于各平台api开发，进行请求接口的处理函数，如果你有多个平台，互相之间要传递数据，用这个函数绝对好用：

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 /**
  * curl访问程序接口
  * @param string
  * @return array
  */
 function getCurlDate($url, $datas, $key) {
     $datas['time'] = $_SERVER['REQUEST_TIME'] + 300;
     $post_data['post'] = urlencode(authcode(serialize($datas), "ENCODE", $key));
 //    echo $url;
     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, $url);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
     // 我们在POST数据哦！
     curl_setopt($ch, CURLOPT_POST, 1);
     // 把post的变量加上
     curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
     $output = curl_exec($ch);
  //   dump(curl_error($ch));
     curl_close($ch);
     return json_decode($output, true);
 }

php获取文件的扩展名：

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 /**
  * @获取文件扩展名
  * @$pic string 图片路径
  */
 function get_file_ext($pic) {
     return substr($pic, strrpos($pic, '.') + 1);
 }

还有一个是可逆的加密、解密函数（加密相同的字符串都会加密成不同的字符串的，非常好用）

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 /**
  * 字符串加密
  * @param   $string     需加密的字符
  * @param   $operation  加密或解密
  * @param   $key        网站加密key，防止破解
  * @return  string
  */
 function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
     $ckey_length = 4;
     $key = md5($key ? $key : '^www.itokit.com$');
     $keya = md5(substr($key, 0, 16));
     $keyb = md5(substr($key, 16, 16));
     $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()), -$ckey_length)) : '';

     $cryptkey = $keya . md5($keya . $keyc);
     $key_length = strlen($cryptkey);

     $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
     $string_length = strlen($string);

     $result = '';
     $box = range(0, 255);

     $rndkey = array();
     for ($i = 0; $i <= 255; $i++) {
         $rndkey[$i] = ord($cryptkey[$i % $key_length]);
     }

     for ($j = $i = 0; $i < 256; $i++) {
         $j = ($j + $box[$i] + $rndkey[$i]) % 256;
         $tmp = $box[$i];
         $box[$i] = $box[$j];
         $box[$j] = $tmp;
     }

     for ($a = $j = $i = 0; $i < $string_length; $i++) {
         $a = ($a + 1) % 256;
         $j = ($j + $box[$a]) % 256;
         $tmp = $box[$a];
         $box[$a] = $box[$j];
         $box[$j] = $tmp;
         $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
     }

     if ($operation == 'DECODE') {
         if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)) {
             return substr($result, 26);
         } else {
             return '';
         }
     } else {
         return $keyc . str_replace('=', '', base64_encode($result));
     }
 }

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 /**
 * 字符串转十六进制
 * @param unknown_type $s
 */
 function str2hex($s) {
   $r = "";
   $hexes = array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
   for ($i=0; $i<strlen($s); $i++)
   $r .= ($hexes [(ord($s{$i}) >> 4)] . $hexes [(ord($s{$i}) & 0xf)]);
   return $r;
 }

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 /**
 * 十六进制转字符串
 * @param unknown_type $s
 */
 function hex2str($s) {
   $r = "";
   for ( $i = 0; $i<strlen($s); $i += 2)
   {
     $x1 = ord($s{$i});
     $x1 = ($x1>=48 && $x1<58) ? $x1-48 : $x1-97+10;
     $x2 = ord($s{$i+1});
     $x2 = ($x2>=48 && $x2<58) ? $x2-48 : $x2-97+10;
     $r .= chr((($x1 << 4) & 0xf0) | ($x2 & 0x0f));
   }
   return $r;
 }

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 /**
 * 返回经addslashes处理过的字符串或数组
 * @param $string 需要处理的字符串或数组
 * @return mixed
 */
 function new_addslashes($string){
   if(!is_array($string)) return addslashes($string);
   foreach($string as $key => $val) $string[$key] = new_addslashes($val);
   return $string;
 }

 /**/
 function addslashes_deep($string)
 {
   return is_array($string) ? array_map('addslashes_deep', $string) : addslashes($string);
 }

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 /**
 * 返回经stripslashes处理过的字符串或数组
 * @param $string 需要处理的字符串或数组
 * @return mixed
 */
 function new_stripslashes($string) {
   if(!is_array($string)) return stripslashes($string);
   foreach($string as $key => $val) $string[$key] = new_stripslashes($val);
   return $string;
 }
 /**/
 function stripslashes_deep($string)
 {
   return is_array($string) ? array_map('stripslashes_deep', $string) : stripslashes($string);
 }

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 /**
 * 返回经 htmlspecialchars 处理过的字符串或数组
 * @param $string 需要处理的字符串或数组
 * @return mixed
 */
 function new_html_special_chars($string) {
   if(!is_array($string)) return htmlspecialchars($string);
   foreach($string as $key => $val) $string[$key] = new_html_special_chars($val);
   return $string;
 }

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 /**
  * 获取请求ip
  *
  * @return ip地址
  */
 function ip() {
   if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
     $ip = getenv('HTTP_CLIENT_IP');
   } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
     $ip = getenv('HTTP_X_FORWARDED_FOR');
   } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
     $ip = getenv('REMOTE_ADDR');
   } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
     $ip = $_SERVER['REMOTE_ADDR'];
   }
   return preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : '';
 }

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 /**
 * 字符截取 支持UTF8/GBK
 * @param $string
 * @param $length
 * @param $dot
 */
 function str_cut($string, $length, $dot = '...') {
   $strlen = strlen($string);
   if($strlen <= $length) return $string;
   $string = str_replace(array(' ',' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), array('∵',' ', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), $string);
   $strcut = '';
   if(strtolower(CHARSET) == 'utf-8') {
     $length = intval($length-strlen($dot)-$length/3);
     $n = $tn = $noc = 0;
     while($n < strlen($string)) {
       $t = ord($string[$n]);
       if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
         $tn = 1; $n++; $noc++;
       } elseif(194 <= $t && $t <= 223) {
         $tn = 2; $n += 2; $noc += 2;
       } elseif(224 <= $t && $t <= 239) {
         $tn = 3; $n += 3; $noc += 2;
       } elseif(240 <= $t && $t <= 247) {
         $tn = 4; $n += 4; $noc += 2;
       } elseif(248 <= $t && $t <= 251) {
         $tn = 5; $n += 5; $noc += 2;
       } elseif($t == 252 || $t == 253) {
         $tn = 6; $n += 6; $noc += 2;
       } else {
         $n++;
       }
       if($noc >= $length) {
         break;
       }
     }
     if($noc > $length) {
       $n -= $tn;
     }
     $strcut = substr($string, 0, $n);
     $strcut = str_replace(array('∵', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), array(' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), $strcut);
   } else {
     $dotlen = strlen($dot);
     $maxi = $length - $dotlen - 1;
     $current_str = '';
     $search_arr = array('&',' ', '"', "'", '“', '”', '—', '<', '>', '·', '…','∵');
     $replace_arr = array('&',' ', '"', ''', '“', '”', '—', '<', '>', '·', '…',' ');
     $search_flip = array_flip($search_arr);
     for ($i = 0; $i < $maxi; $i++) {
       $current_str = ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
       if (in_array($current_str, $search_arr)) {
         $key = $search_flip[$current_str];
         $current_str = str_replace($search_arr[$key], $replace_arr[$key], $current_str);
       }
       $strcut .= $current_str;
     }
   }
   return $strcut.$dot;
 }

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 /**
 * 产生随机字符串
 *
 * @param        int                $length    输出长度
 * @param        string         $chars     可选的 ，默认为 0123456789
 * @return     string         字符串
 */
 function random($length, $chars = '0123456789') {
   $hash = '';
   $max = strlen($chars) - 1;
   for($i = 0; $i < $length; $i++) {
     $hash .= $chars[mt_rand(0, $max)];
   }
   return $hash;
 }

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 /**
 * 将字符串转换为数组
 *
 * @param  string  $data  字符串
 * @return  array  返回数组格式，如果，data为空，则返回空数组
 */
 function string2array($data) {
   if($data == '') return array();
   eval("\$array = $data;");
   return $array;
 }

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 /**
 * 将数组转换为字符串
 *
 * @param  array  $data    数组
 * @param  bool  $isformdata  如果为0，则不使用new_stripslashes处理，可选参数，默认为1
 * @return  string  返回字符串，如果，data为空，则返回空
 */
 function array2string($data, $isformdata = 1) {
   if($data == '') return '';
   if($isformdata) $data = new_stripslashes($data);
   return addslashes(var_export($data, TRUE));
 }

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 /**
 * 转换字节数为其他单位
 *
 *
 * @param        string        $filesize        字节大小
 * @return        string        返回大小
 */
 function sizecount($filesize) {
         if ($filesize >= 1073741824) {
                 $filesize = round($filesize / 1073741824 * 100) / 100 .' GB';
         } elseif ($filesize >= 1048576) {
                 $filesize = round($filesize / 1048576 * 100) / 100 .' MB';
         } elseif($filesize >= 1024) {
                 $filesize = round($filesize / 1024 * 100) / 100 . ' KB';
         } else {
                 $filesize = $filesize.' Bytes';
         }
         return $filesize;
 }