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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
...景下比较麻烦，好在我的场景主要是手机单向发送指令，问题不大。
最终效果
成果超出预期：
- 手机放在沙发上，20米内流畅控制（HC-05标称10米，实测无遮挡30米都可控）
- 方向盘实时映射，没有肉眼可见的延迟
- 儿子...
Why is textarea filled with mysterious white spaces?
...
Open (and close!) your PHP tags right after, and before, your textarea tags:
<textarea style="width:350px; height:80px;" cols="42" rows="5" name="sitelink"><?php
if($siteLink_val) echo $siteLink_val;
?></textarea>
...
typecast string to integer - Postgres
...ing into an integer.
Solution
Create a user-defined function inspired by PHP's intval() function.
CREATE FUNCTION intval(character varying) RETURNS integer AS $$
SELECT
CASE
WHEN length(btrim(regexp_replace($1, '[^0-9]', '','g')))>0 THEN btrim(regexp_replace($1, '[^0-9]', '','g'))::intege...
MongoDB with redis
... mongoose issues a new query where it tries to find a blogpost with _id of 123, the query flows into the cache server, the cache server will check to see if it has a result for any query that was looking for an _id of 123.
If it does not exist in the cache server, this query is taken and sent on to...
How to ignore files which are in repository?
I have a file (config.php), that is already commited to Git repository, but I want to ignore locally, i.e. I want that file to remain in repository, but force Git to ignore any changes to it.
...
Applying a function to every row of a table using dplyr?
...red May 22 '17 at 21:26
CoderGuy123CoderGuy123
4,7134646 silver badges7373 bronze badges
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Natural Sort Order in C#
...s need to be compared section-wise, i.e., 'abc12b' should be less than 'abc123'.
– SOUser
Feb 18 '13 at 22:14
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Difference between VARCHAR and TEXT in MySQL [duplicate]
...up to 16 MB, LONGTEXT up to 4 GB. If you use LONGTEXT and get the data via PHP (at least if you use mysqli without store_result), you maybe get a memory allocation error, because PHP tries to allocate 4 GB of memory to be sure the whole string can be buffered. This maybe also happens in other langua...
How to customise file type to syntax associations in Sublime Text?
...llows you to enable syntax for composite extensions (e.g. sql.mustache, js.php, etc ... )
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How to make a website secured with https
...or secure coding in mind (here is a good intro: http://www.owasp.org/index.php/Secure_Coding_Principles ), otherwise all you need is a correctly set up SSL certificate.
Is SSL and https one and the same..
Pretty much, yes.
Do I need to apply with someone to get
some license or something....