php中常用的函数集合

<script>ec(2);</script>

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("  }
 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);
}