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【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
AppInventor,AppInventor2,拓展0
How to specify Composer install path?
...allers package, as symfony1 have a plugin there :) Check Symfony1Installer.php
– spirit
Apr 2 at 8:04
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Can inner classes access private variables?
...d, a nested class does NOT have special access to its enclosing class. See sec 11.8.1 of the standard. HOWEVER see also this standard defect: open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#45
– Greg Rogers
Mar 9 '09 at 20:13
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Convert Object to JSON string
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SPL = Standard PHP Library. Guess in this case is would be SJL (standard javascript library).
– David J Eddy
Oct 30 '13 at 15:24
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How to convert 1 to true or 0 to false upon model fetch
...d"]==="0"); // false
console.log(obj["isChecked"]==="Elephant"); // false
PHP
Same concept in PHP
$obj["isChecked"] = ($obj["isChecked"] == "1");
The same operator limitations as stated above for JavaScript apply.
Double Not
The 'double not' also works. It's confusing when people first read it but...
Principal component analysis in Python
...r the OP's needs (my example above, with 262144 dimensions takes only ~7.5 sec on a normal laptop), and it is much more numerically stable than the eigendecomposition method (see dwf's comment below). I also note that the accepted answer uses SVD as well!
– ali_m
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Service Temporarily Unavailable Magento?
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@jQuery.PHP.Magento.com It would be in the root folder of your magento website. But it will only be there if the site is stuck in maintenance mode. Under normal operations this file won't exist.
– elMarquis
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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...
Parallel.ForEach vs Task.Factory.StartNew
... task per item, but rather batch this to lower the overhead involved.
The second option will schedule a single Task per item in your collection. While the results will be (nearly) the same, this will introduce far more overhead than necessary, especially for large collections, and cause the overal...
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...