为什么这两个函数的输出不同？

Question

$value = '\\40';
file_put_contents('o.txt',$value);
file_put_contents('o2.txt',var_export($value,true));


D:\test>php str.php
D:\test>cat o.txt
\40
D:\test>cat o2.txt
'\\40'

Answer 1

Because var_export outputs or returns a parsable string representation of a variable

http://de.php.net/manual/en/function.var-export.php

Your code works perfectly. ;) Does just what it is expected to.