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App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
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APPINVENTOR测试平台：AppInventor2中文网（https://www.fun123.cn）
MQTT组件：已内置，设计器「通信连接」里的「MQTT客户端」直接拖入即可，本教程用到的功能它全都有；需要证书认证、遗嘱消息等高级用法时，再到MQTT中...
How to replace case-insensitive literal substrings in Java
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I mean two things: 1. "blÁÜ123".replaceAll("(?i)bláü") does not replace anything. 2. "Sentence!End".replaceAll("(?i)Sentence.") does maybe replace more than anticipated.
– stracktracer
Apr 11 '12 at 11:54
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How to get everything after a certain character?
...e, then substr grabs everything from that index plus 1, onwards.
$data = "123_String";
$whatIWant = substr($data, strpos($data, "_") + 1);
echo $whatIWant;
If you also want to check if the underscore character (_) exists in your string before trying to get it, you can use the following:...
How can I select an element with multiple classes in jQuery?
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123
For the case
<element class="a">
<element class="b c">
</element>
</...
Checking if sys.argv[x] is defined
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David WoleverDavid Wolever
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How to set a cookie for another domain
...an image on domain A.
<img src="http://www.example.com/cookie.php?val=123" style="display:none;">
And then on domain B that is example.com in cookie.php you'll have the following code:
<?php
setcookie('a', $_GET['val']);
?>
Hattip to Subin
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Tracking the script execution time in PHP
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123
Shorter version of talal7860's answer
<?php
// At start of script
$time_start = microtime(...
Sample random rows in dataframe
...b
1: 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
2: 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
3: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
4: 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
5: 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
6: 15.5 8 318.0 150 2...
How do I fix “Failed to sync vcpu reg” error?
...BI=x86, and I was running on a macbook pro.
– guyland123
Nov 20 '15 at 13:45
3
this is really a p...
How do I rename the extension for a bunch of files?
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123
This worked for me on OSX from .txt to .txt_bak
find . -name '*.txt' -exec sh -c 'mv "$0" "${...