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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...能。
2.主题：编写“健身宝”手机应用程序
3.问题：
（1）如何获取走路步数、距离？
（2）如何计算走路时间？
（3）如何获得当前位置？
（4）如何存储信息？
4.规划：
（1）利用pedome...
WordPress is giving me 404 page not found for all pages except the homepage
...sts and the httpd.conf should be correct.
In my case, I changed the file /etc/apache2/apache2.conf in section:
<Directory "/var/www/html">
Line changed is:
AllowOverride None
to
AllowOverride All
And restart the web server with
systemctl restart apache2
...
创业 比“直男癌”更可怕的是“技术癌” - 资讯 - 清泛网 - 专注C/C++及内核技术
...方案成本过高，则实用性大大降低，仍然无法真正地解决问题。更有甚者，明明市场上已有采用通用技术的、低成本的解决方案，却仅仅因为对技术的痴迷而生搬硬套地非要用高科技、高大上的手段去替代现有方案，却无视其带...
Fastest way to check if a string is JSON in PHP?
...pecify it as a string or a true number. 6.5 = true, '300' = true, 9 = true etc. So this might be a valid JSON value but the function might not behave as you expect, if you want to check only for valid JSON strings with {} or [];
– BadHorsie
Feb 25 '14 at 16:57
...
Checking if array is multidimensional or not?
...b level existed. For theories who might be looking for something similar...etc.
– Mike Barwick
Mar 24 '15 at 19:27
Wha...
How do I close a single buffer (out of many) in Vim?
...point.. copy and paste a few lines of text to use as a template of sorts.. etc. I would type the following:
:bd txt <Tab>
Note that the matching string does not have to be at the start of the file name.
The above displays the list of file names that match 'txt' at the bottom of the screen...
How can I get the current page name in WordPress?
...fore the loop, before $post is populated, before $wp_query is initialized, etc...) you really have no choice but to access the server variables themselves and extract the requested page from the query string.
$page_slug = trim( $_SERVER["REQUEST_URI"] , '/' )
Note that this is a "dumb" solution. ...
How to use a switch case 'or' in PHP
...statements, eg: to test if a value is "greater than 3", "between 4 and 6", etc. If you need to do something like that, stick to using if statements, or if there's a particularly strong need for switch then it's possible to use it back to front:
switch (true) {
case ($value > 3) :
// ...
I have 2 dates in PHP, how can I run a foreach loop to go through all of those days?
... + 86400 ) {
$thisDate = date( 'Y-m-d', $i ); // 2010-05-01, 2010-05-02, etc
}
When using PHP with a timezone having DST, make sure to add a time that is not 23:00, 00:00 or 1:00 to protect against days skipping or repeating.
...
What is the difference between is_a and instanceof?
...object
$x1 instanceof $x2 // returns false even if $x2 is int, undefined, etc.
So, is_a() highlights possible bugs while instanceof suppresses them.
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