php中常用的函数集合

function getip() {
 if(getenv('http_client_ip') && strcasecmp(getenv('http_client_ip'), 'unknown')) {
  $onlineip = getenv('http_client_ip');
 } elseif(getenv('http_x_forwarded_for') && strcasecmp(getenv('http_x_forwarded_for'), 'unknown')) {
  $onlineip = getenv('http_x_forwarded_for');
 } elseif(getenv('remote_addr') && strcasecmp(getenv('remote_addr'), 'unknown')) {
  $onlineip = getenv('remote_addr');
 } elseif(isset($_server['remote_addr']) && $_server['remote_addr'] && strcasecmp($_server['remote_addr'], 'unknown')) {
  $onlineip = $_server['remote_addr'];
 }
 $onlineip = preg_replace("/^([d.]+).*/", "1", $onlineip);
 return $onlineip;
}

function htmlout($str){
 $guest=$str;
 $guest=str_replace("&","&",$guest);
 $guest=str_replace("  ","　",$guest);
 //$guest=str_replace(" "," ",$guest);
 $guest=str_replace(" ","　",$guest);
 //$guest=htmlspecialchars($guest);
 $guest=str_replace(">",">",$guest);
 $guest=str_replace("  $guest=str_replace("rn","
",$guest);
 $guest=str_replace("'","'",$guest);
 $guest=str_replace(""",""",$guest);
 return($guest);
}
function badstr ($str,$to='*') {
 global $global;
 $from = $str;
 $rg_banname=$global['m_badwords'];
 $rg_banname=explode(',',$rg_banname);
 foreach($rg_banname as $value){
  if(strpos($str,$value)!==false){
   //$from = strtr($str,$value,$to);
   $from = str_replace($value,$to,$from);
  }
 }
 return($from);
}
function mkpath($mkpath,$mode=0777){
    $path_arr=explode('/',$mkpath);
    foreach ($path_arr as $value){
        if(!empty($value)){
            if(empty($path))$path=$value;
            else $path.='/'.$value;
            is_dir($path) or mkdir($path,$mode) or chmod($path,$mode);
        }
    }
    if(is_dir($mkpath))return true;
    return false;
}
function daddslashes($string, $force = 0) {
 global $magic_quotes_gpc;
 if(!$globals['magic_quotes_gpc'] || $force || $magic_quotes_gpc) {
  if(is_array($string)) {
   foreach($string as $key => $val) {
    $string[$key] = daddslashes($val, $force);
   }
  } else {
   $string = addslashes($string);
  }
 }
 return $string;
}
function dhtmlspecialchars($string) {
 if(is_array($string)) {
  foreach($string as $key => $val) {
   $string[$key] = dhtmlspecialchars($val);
  }
 } else {
  $string = preg_replace('/&((#(d{3,5}|x[a-fa-f0-9]{4})|[a-za-z][a-z0-9]{2,5});)/', '&1',
  str_replace(array('&', '"', ''), array('&', '"', '<', '>'), $string));
 }
 return $string;
}
function trimm ($str) {
 $str = trim(str_replace(" ","　",$str));
 //$str = str_replace("'","‘",$str);
 return $str;
}
function cdstr($length) {
 $possible = "0123456789";
 $str = "";
 while(strlen($str)  return($str);
}
function cdstrletters($length) {
 $possible = "abcdefghijklmnopqrstuvwxyz";
 $str = "";
 while(strlen($str)  return($str);
}
function cdnumletters($length) {
 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
 $str = "";
 while(strlen($str)  return($str);
}