php 类的静态变量的初始化

共有的成员还有办法解决，例如：
class A {
static public $child;
}
A::$child = new B();

对于私有的成员似乎就没有什么干净的方法了，只能这样做：
class A {
static private $child;
static public initialize() {
self::$child = new B();
}
}
A::initialize();

foreach(array('_GET','_POST') as $_request) {
 foreach($$_request as $_key => $_value) {
  if ($_key{0} != '_') {
   if (IS_GPC) {
    $_value = s_array($_value);
   }
   $$_key = $_value;
  }
 }
}

function s_array(&$array) {
 if (is_array($array)) {
  foreach ($array as $k => $v) {
   $array[$k] = s_array($v);
  }
 } else if (is_string($array)) {
  $array = stripslashes($array);
 }
 return $array;
}

// 清除HTML代码
function html_clean($content) {
 $content = htmlspecialchars($content);
 $content = str_replace("n", "<br />", $content);
 $content = str_replace("  ", "&nbsp;&nbsp;", $content);
 $content = str_replace("t", "&nbsp;&nbsp;&nbsp;&nbsp;", $content);
 return $content;
}

php 获取系统当前路径与检查php配置参数
function getPath($mainpath, $relativepath) {
  global $dir;
  $mainpath_info           = explode('/', $mainpath);
  $relativepath_info       = explode('/', $relativepath);
  $relativepath_info_count = count($relativepath_info);
  for ($i=0; $i<$relativepath_info_count; $i++) {
   if ($relativepath_info[$i] == '.' || $relativepath_info[$i] == '') continue;
   if ($relativepath_info[$i] == '..') {
    $mainpath_info_count = count($mainpath_info);
    unset($mainpath_info[$mainpath_info_count-1]);
    continue;
   }
   $mainpath_info[count($mainpath_info)] = $relativepath_info[$i];
  } //end for
  return implode('/', $mainpath_info);
 }

 // 检查PHP配置参数
 function getphpcfg($varname) {
  switch($result = get_cfg_var($varname)) {
   case 0:
   return "No";
   break;
   case 1:
   return "Yes";
   break;
   default:
   return $result;
   break;
  }
 }

php 数据库在线备份代码

function sqldumptable($table, $fp=0) {
  $tabledump = "DROP TABLE IF EXISTS $table;n";
  $tabledump .= "CREATE TABLE $table (n";

  $firstfield=1;

  $fields = mysql_query("SHOW FIELDS FROM $table");
  while ($field = mysql_fetch_array($fields)) {
   if (!$firstfield) {
    $tabledump .= ",n";
   } else {
    $firstfield=0;
   }
   $tabledump .= "   $field[Field] $field[Type]";
   if (!empty($field["Default"])) {
    $tabledump .= " DEFAULT '$field[Default]'";
   }
   if ($field['Null'] != "YES") {
    $tabledump .= " NOT NULL";
   }
   if ($field['Extra'] != "") {
    $tabledump .= " $field[Extra]";
   }
  }
  mysql_free_result($fields);
 
  $keys = mysql_query("SHOW KEYS FROM $table");
  while ($key = mysql_fetch_array($keys)) {
   $kname=$key['Key_name'];
   if ($kname != "PRIMARY" and $key['Non_unique'] == 0) {
    $kname="UNIQUE|$kname";
   }
   if(!is_array($index[$kname])) {
    $index[$kname] = array();
   }
   $index[$kname][] = $key['Column_name'];
  }
  mysql_free_result($keys);

  while(list($kname, $columns) = @each($index)) {
   $tabledump .= ",n";
   $colnames=implode($columns,",");

   if ($kname == "PRIMARY") {
    $tabledump .= "   PRIMARY KEY ($colnames)";
   } else {
    if (substr($kname,0,6) == "UNIQUE") {
     $kname=substr($kname,7);
    }
    $tabledump .= "   KEY $kname ($colnames)";
   }
  }

  $tabledump .= "n);nn";
  if ($fp) {
   fwrite($fp,$tabledump);
  } else {
   echo $tabledump;
  }

  $rows = mysql_query("SELECT * FROM $table");
  $numfields = mysql_num_fields($rows);
  while ($row = mysql_fetch_array($rows)) {
   $tabledump = "INSERT INTO $table VALUES(";

   $fieldcounter=-1;
   $firstfield=1;
   while (++$fieldcounter<$numfields) {
    if (!$firstfield) {
     $tabledump.=", ";
    } else {
     $firstfield=0;
    }

    if (!isset($row[$fieldcounter])) {
     $tabledump .= "NULL";
    } else {
     $tabledump .= "'".mysql_escape_string($row[$fieldcounter])."'";
    }
   }

   $tabledump .= ");n";

   if ($fp) {
    fwrite($fp,$tabledump);
   } else {
    echo $tabledump;
   }
  }
  mysql_free_result($rows);
 }

@mysql_connect($servername,$dbusername,$dbpassword) or die("数据库连接失败");
 @mysql_select_db($dbname) or die("选择数据库失败"); 
 $table = array_flip($_POST['table']);
 $result = mysql_query("SHOW tables");
 echo ($result) ? NULL : "出错: ".mysql_error();

 $filename = basename($_SERVER['HTTP_HOST']."_MySQL.sql");
 header('Content-type: application/unknown');
 header('Content-Disposition: attachment; filename='.$filename);
 $mysqldata = '';
 while ($currow = mysql_fetch_array($result)) {
  if (isset($table[$currow[0]])) {
   $mysqldata.= sqldumptable($currow[0]);
   $mysqldata.= $mysqldata."rn";
  }
 }
 mysql_close();
 exit;

function copy($from, $to) {
  if ($this->abspath($to)=="/") $to=$this->basedir;
  if ($this->dirname($from) == $this->dirname($to)) $to = $this->dirname($to).'/复件'.basename($from);
  if (!is_dir($from)) {
   return @copy($from, $to);
  } else {
   if (!is_dir($to)) @mkdir($to);
   $path = opendir($from);
   while( $file = readdir( $path ) ) {
    if (($file=='.')||($file=='..')) continue;
    if (is_dir($from.'/'.$file)) $this->copy($from.'/'.$file, $to.'/'.$file);
    else echo basename($file), copy($from.'/'.$file, $to.'/'.$file) ? ' Success!' : ' False.', '<br />';
   }
   return true;
  }
 }