怎么用PHP创建唯一的临时文件
如何用PHP创建唯一的临时文件
$tmpfile = tempnam( getcwd()."/", "TMP" ); // 创建唯一的临时文件
tempnam -- 建立一个具有唯一文件名的文件
语法：string tempnam ( string dir, string prefix )
tempnam是在指定的目录下建立以prefix为前缀的唯一的临时文件（TMP(*).tmp），文件名的后缀名为tmp，这边传递的前缀（prefix）,长度最大为3，如果超过了3，后面的将被截断。比如，你写TEMP,只取TEM作为前缀。
另外，getcwd函数是取得当前工作目录(get current work dir)。
// current directory
echo getcwd() . "\n"; //echo /home/didou
chdir('cvs');
// current directory
echo getcwd() . "\n"; //echo /home/didou/cvs
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