一些php项目中比较通用的php自建函数的详解_PHP教程

/**
 * 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); 
} 

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

/**
 * 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         $rndkey[$i] = ord($cryptkey[$i % $key_length]); 
    } 

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

    for ($a = $j = $i = 0; $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)); 
    } 
} 

/**
* 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  $r .= ($hexes [(ord($s{$i}) >> 4)] . $hexes [(ord($s{$i}) & 0xf)]); 
  return $r; 
}

/**
* 十六进制转字符串
* @param unknown_type $s
*/ 
function hex2str($s) { 
  $r = ""; 
  for ( $i = 0; $i  { 
    $x1 = ord($s{$i}); 
    $x1 = ($x1>=48 && $x1    $x2 = ord($s{$i+1}); 
    $x2 = ($x2>=48 && $x2    $r .= chr((($x1   } 
  return $r; 
} 

/**
* 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); 
} 

/**
* 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); 
} 

/**
* 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; 
} 

/**
 * 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] : ''; 
} 

/**
* 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   $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       $t = ord($string[$n]); 
      if($t == 9 || $t == 10 || (32         $tn = 1; $n++; $noc++; 
      } elseif(194         $tn = 2; $n += 2; $noc += 2; 
      } elseif(224         $tn = 3; $n += 3; $noc += 2; 
      } elseif(240         $tn = 4; $n += 4; $noc += 2; 
      } elseif(248         $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       $current_str = ord($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; 
} 

/**
* 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     $hash .= $chars[mt_rand(0, $max)]; 
  } 
  return $hash; 
} 

/**
* 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; 
} 

/**
* 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)); 
} 

/**
* 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; 
}