session_start();会导致flock失败？
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--><?php session_start();
$file = "temp.txt";
$fp = fopen($file , 'w');
if(flock($fp , LOCK_EX | LOCK_NB)){
sleep(10);
echo 'a';
flock($fp , LOCK_UN);
} else{
echo "Lock file failed...\n";
}
fclose($fp);
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