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[解决]Missing Constraint: Bundle-RequiredExecutionEnvironment: J2SE-1....
...: www eclipse org downloads 参考：https: www eclipse org forums index php t 1089568 原因：eclipse版本太老了，java版本太新了不匹配导致。
解决：安装最新的eclipse，地址：https://www.eclipse.org/downloads/
参考：https://www.eclipse.org/forums/index.php/t/1089...
【持续更新】App Inventor 2 中文拓展一览 - App Inventor 2 中文网 - 清泛...
...制数据
【数据库】LeanDB 数据库扩展
【数据库】MySQL + php后端数据库
【数据库】MongoDB + php后端数据库
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jQuery/Javascript function to clear all the fields of a form [duplicate]
... the $('#myForm').trigger("reset"); method to refresh/reset checkboxes and etc...!
– James111
Jun 20 '15 at 4:26
2
...
Difference between var_dump,var_export & print_r
...2] => 42
[3] => Array ([0] => 42)
)
var_export prints valid php code. Useful if you calculated some values and want the results as a constant in another script. Note that var_export can not handle reference cycles/recursive arrays, whereas var_dump and print_r check for these. var_exp...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...ing in Mongo itself, it is possible to have duplicate _id's generated with PHP in Mongo.
The use-case where this has happened with regularity for me is when I'm looping through a dataset and attempting to inject the data into a collection.
The array that holds the injection data must be explicitl...
Possible reason for NGINX 499 error codes
... be in your infrastructure like maybe a CDN, Load Balacer, a Varnish cache etc. Others can be in user side like a caching proxy etc.
If there are proxies on your side like a LoadBalancer / CDN ... you should set the timeouts to timeout first your backend and progressively the other proxies to the u...
Microsoft Excel mangles Diacritics in .csv files?
I am programmatically exporting data (using PHP 5.2) into a .csv test file.
Example data: Numéro 1 (note the accented e).
The data is utf-8 (no prepended BOM).
...
What's the “average” requests per second for a production web application?
...y make per second
c. the number of additional requests (i.e. ajax calls, etc)
As to what is considered fast.. do you mean how few requests a site can take? Or if a piece of hardware is considered fast if it can process xyz # of requests per second?
...
Why is arr = [] faster than arr = new Array?
...ntext which may contain the "arguments" object, locally defined variables, etc. If we cannot find it in the Activation object, we begin looking up the scope chain until we reach the global scope. If nothing is found, we throw a ReferenceError.
Once we've located the variable declaration, we invoke...
Tetris-ing an array
...ext element will be www, it is the same in all arrays, so it gets removed, etc.
Something like (untested)
$exploded_paths = array();
foreach($paths as $path) {
$exploded_paths[] = explode('/', $path);
}
$equal = true;
$ref = &$exploded_paths[0]; // compare against the first path for simp...