php跨平台总结 常用预定义常量

 

<?php
/**
 * 获得用户操作系统的换行符 
 *
 * @access  public 
 * @return  string 
 */  
function get_crlf()
{
	/* LF (Line Feed, 0x0A, \N) 和 CR(Carriage Return, 0x0D, \R) */
	if (stristr($_SERVER['HTTP_USER_AGENT'], 'Win')){
		$the_crlf = '\r\n';
	}elseif (stristr($_SERVER['HTTP_USER_AGENT'], 'Mac')){
		$the_crlf = '\r'; // for old MAC OS
	}else{
		$the_crlf = '\n';
	}

	return $the_crlf;
}
// *nix
echo DIRECTORY_SEPARATOR; // /
echo PHP_SHLIB_SUFFIX;    // so
echo PATH_SEPARATOR;      // :

// Win*
echo DIRECTORY_SEPARATOR; // \
echo PHP_SHLIB_SUFFIX;    // dll
echo PATH_SEPARATOR;      // ;
define('DS', DIRECTORY_SEPARATOR);
define('PS', PATH_SEPARATOR);
?> 
 

if  ( strtoupper ( substr (PHP_OS, 0, 3)) ===  'WIN' ) {     得到操作系统类型

DEFAULT_INCLUDE_PATH  得到php.ini中配置的include_path

$text = str_replace(array("\n", "\r", "\r\n"), "", $text);