一些php项目中比较通用的php自建函数的详解

以下一些php函数是我们it动力最常用的项目开发函数，这些函数还算是在比较多的项目中使用到的，也是比较通用的。
1.请求接口的处理函数
复制代码 代码如下:
 
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); 
} 

2.获取文件扩展名
复制代码 代码如下:
 
function get_file_ext($pic) { 
    return substr($pic, strrpos($pic, '.') + 1); 
} 

3.可逆的加密、解密函数
复制代码 代码如下:
 
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)); 
    } 
} 

4.字符串转十六进制
复制代码 代码如下:
 
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; 
}

5.十六进制转字符串
复制代码 代码如下:
 
function hex2str($s) { 
  $r = ""; 
  for ( $i = 0; $i  { 
    $x1 = ord($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; 
} 

6.返回经addslashes处理过的字符串或数组
复制代码 代码如下:
 
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); 
} 

7.返回经stripslashes处理过的字符串或数组
复制代码 代码如下:
 
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); 
} 

8.返回经 htmlspecialchars 处理过的字符串或数组
复制代码 代码如下:
 
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; 
} 

9.获取请求ip
复制代码 代码如下:
 
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] : ''; 
} 

10.字符截取 支持UTF8/GBK
复制代码 代码如下:
 
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; 
} 

11.产生随机字符串
复制代码 代码如下:
 
function random($length, $chars = '0123456789') { 
  $hash = ''; 
  $max = strlen($chars) - 1; 
  for($i = 0; $i < $length; $i++) { 
    $hash .= $chars[mt_rand(0, $max)]; 
  } 
  return $hash; 
} 

12.将字符串转换为数组
复制代码 代码如下:
 
function string2array($data) { 
  if($data == '') return array(); 
  eval("$array = $data;"); 
  return $array; 
} 

13.将数组转换为字符串
复制代码 代码如下:
 
function array2string($data, $isformdata = 1) { 
  if($data == '') return ''; 
  if($isformdata) $data = new_stripslashes($data); 
  return addslashes(var_export($data, TRUE)); 
} 

14.转换字节数为其他单位
复制代码 代码如下:
 
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; 
}