php5 通用兼容的公共文件.

每次新项目, 都要为环境配置做许多php的修正, 为此, 我整理了这一份通用的php抬头文件. 
使用方法, 将代码保存为某个php文件, 然后在项目中引入即可. 

代码作用如下: 
  1: 规范化编码问题, utf-8, 时间区域, 数字长度都有变更. 
  2: 规范化字符转义问题, 全部采用php5.3之后的标准, 都不转化. 
  3: session, gzip做判断启动. 这有利于防止隐性冲突. 
  4: 对server数组进行整理, 隐藏掉一些非安全段, 增加以http_开头的一些数据, 如内存占用, 起始时间, 当前url地址, ip, get, post等等. 你只要打印出$_server数组, 基本上许多数据就都有了, 并且它是超全局的.

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 $v) $_GET[$k] = stripslashes($v);
 foreach($_POST as $k => $v) $_POST[$k] = stripslashes($v);
 foreach($_COOKIE as $k => $v) $_COOKIE[$k] = stripslashes($v);
}
# 清空$_ENV数组, 释放掉$_SERVER数组中几个关键性数值. 
unset($_ENV, $_SERVER['MIBDIRS'],$_SERVER['MYSQL_HOME'],$_SERVER['OPENSSL_CONF'],$_SERVER['PHP_PEAR_SYSCONF_DIR'],$_SERVER['PHPRC'],$_SERVER['SystemRoot'],$_SERVER['COMSPEC'],$_SERVER['PATHEXT'], $_SERVER['WINDIR'],$_SERVER['PATH']);
# 一些函数.
function ini_end(){}
function ini_sets($key, $val){return @ini_set($key, $val);}
function ini_http_server(){
 if (!$_SERVER['REQUEST_URI']) { // IIS 5 compatibility
 $_SERVER['REQUEST_URI'] = $_SERVER['ORIG_PATH_INFO'];
}
 if (!strpos($_SERVER['REQUEST_URI'], '?') && $_SERVER['QUERY_STRING'] != '') { // IIS 7 compatibility
 $_SERVER['REQUEST_URI'] .= '?'.$_SERVER['QUERY_STRING'];
}
 $_SERVER['REQUEST_URI'] = strtr($_SERVER['REQUEST_URI'], array('&&'=>'&'));
 $HTTPS = $_SERVER['HTTPS'] && strcasecmp($_SERVER['HTTPS'], 'off');
 $php_selfs = rawurlencode(dirname($_SERVER['SCRIPT_NAME']));
 $php_selfs = strtr($php_selfs, array('%2F'=>'/','%5C'=>'/'));
 $php_selfs = trim($php_selfs, '/');
if($php_selfs)
 $_SERVER['REQUEST_URI'] = strtr($_SERVER['REQUEST_URI'], array($php_selfs.'/'=>''));
 $httppre = (!$HTTPS)?'http':'https';
 if($_SERVER['SERVER_PORT'] !== '80' && $_SERVER['SERVER_PORT'] !== '443'){
 $host = trim($httppre.'://'.$_SERVER['HTTP_HOST'].':'.$_SERVER['SERVER_PORT'].'/'.$php_selfs,'/').'/';
}else{
 $php_selfs && $php_selfs ='/'.$php_selfs;
 $host = trim($httppre.'://'.$_SERVER['HTTP_HOST'].$php_selfs,'/').'/';
}
 $files = trim($_SERVER['REQUEST_URI'], './');
 $_SERVER['HTTP_URL'] = $host.$files;
 $_SERVER['HTTP_PATH'] = $_SERVER['DOCUMENT_ROOT'].'/';
 $_SERVER['HTTP_IP'] = max(getenv('SERVER_ADDR'),getenv('REMOTE_ADDR'),getenv('HTTP_X_FORWARDED_FOR'),getenv('HTTP_CLIENT_IP'));
 $_SERVER['HTTP_TIME_FLOAT'] = microtime(true);
 $_SERVER['HTTP_MEMORY_PEAK_USAGE'] = memory_get_peak_usage();
 $_SERVER['HTTP_MEMORY_USAGE'] = memory_get_usage();
 $_SERVER['HTTP_GET'] = $_GET;
 $_SERVER['HTTP_POST'] = $_POST;
 $_SERVER['HTTP_COOKIE'] = $_COOKIE;
}