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怎么得到指定相对路径的绝对路径

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2016-06-13 13:53:241010browse

如何得到指定相对路径的绝对路径
php 如何得到指定相对路径的绝对路径

相对路径是../new 
如何得到相对路径

------解决方案--------------------
realpath
------解决方案--------------------
$_SERVER['DOCUMENT_ROOT']可以知道站点的绝对路径
------解决方案--------------------
chdir('/var/www/');
echo realpath('./../../etc/passwd');
?> 

输出:/etc/passwd

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