php数组对百万数据进行排除重复数据的实现代码

php  /  管理员 发布于 8年前   228

//定义一个数组，用于存放排重后的结果
$result = array();
//读取uid列表文件
$fp = fopen('test.txt', 'r');

while(!feof($fp))
{
$uid = fgets($fp);
$uid = trim($uid);
$uid = trim($uid, "\r");
$uid = trim($uid, "\n");

if($uid == '')
{
continue;
}
//以uid为key去看该值是否存在
if(empty($result[$uid]))
{
$result[$uid] = 1;
}
}

fclose($fp);

//将结果保存到文件
$content = '';
foreach($result as $k => $v)
{
$content .= $k."\n";
}
$fp = fopen('result.txt', 'w');
fwrite($fp, $content);
fclose($fp);
?>