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分享关于$_SESSION的用法
1. 直接在代码里使用$_SESSION['count']
$_SESSION['count']++;
2. 使用变量
$count = $_SESSION['count];
...
$count++;
...
$_SESSION['count'] = $count;
那种方式更可取？
$_SESSION['count']++;
2. 使用变量
$count = $_SESSION['count];
...
$count++;
...
$_SESSION['count'] = $count;
那种方式更可取？
...全文
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BlackBone 2004-05-13
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session的内容是否会在页面打开时加载到内存里？
如果是这样的话，那第一种方式应该更好些
如果是这样的话，那第一种方式应该更好些
ccterran 2004-05-13
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都可取。但前者看起来更简便一些。
BlackBone 2004-05-13
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在http://www.php.net/manual/zh/ref.session.php有这么一段：
A small warning! $_SESSION can be slooowwwww....
I've never heard of this, but it turns out $_SESSION is much slower than any regular array, even an exact copy of $_SESSION. Copying large amounts of data in/out of $_SESSION is seriously slow and each access to $_SESSION is noticeably slower than regular arrays.
The lesson I learned? Don't use $_SESSION in loops that run very much. Even copying data from $_SESSION before the loop won't help a lot if there's a lot of data there due to a delay that can be pretty hefty, almost equal to working directly on $_SESSION with foreach() and actually slower than working directly on $_SESSION if you need to put the data back in the array in my experience. It's better to pass the data another way if possible, i.e. save the SQL query and re-run, store in a database, etc.
Just a warning for those who may be using this array in medium to large loops or trying to pass lots of data. I hope it saves you the hours of optimizing I've had to spend!
A small warning! $_SESSION can be slooowwwww....
I've never heard of this, but it turns out $_SESSION is much slower than any regular array, even an exact copy of $_SESSION. Copying large amounts of data in/out of $_SESSION is seriously slow and each access to $_SESSION is noticeably slower than regular arrays.
The lesson I learned? Don't use $_SESSION in loops that run very much. Even copying data from $_SESSION before the loop won't help a lot if there's a lot of data there due to a delay that can be pretty hefty, almost equal to working directly on $_SESSION with foreach() and actually slower than working directly on $_SESSION if you need to put the data back in the array in my experience. It's better to pass the data another way if possible, i.e. save the SQL query and re-run, store in a database, etc.
Just a warning for those who may be using this array in medium to large loops or trying to pass lots of data. I hope it saves you the hours of optimizing I've had to spend!
