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Sort array of objects by object fields
... second argument. Here are some examples:
Using anonymous functions (from PHP 5.3)
usort($your_data, function($a, $b) {return strcmp($a->name, $b->name);});
From inside a class
usort($your_data, array($this, "cmp")); // "cmp" should be a method in the class
Using arrow functions (from...
Grabbing the href attribute of an A element
...t;getElementsByTagName('a') as $node) {
echo $dom->saveHtml($node), PHP_EOL;
}
The above would find and output the "outerHTML" of all A elements in the $html string.
To get all the text values of the node, you do
echo $node->nodeValue;
To check if the href attribute exists you can ...
micro:bit 微控制器教程 · App Inventor 2 中文网
...感器数据监控
3. 双向通信
常见问题
Q: 扫描不到 micro:bit 设备？
Q: 连接失败？
Q: 无法接收温度数据？
Q: 控制指令无效？
扩展功能
1. 添...
How do I remove  from the beginning of a file?
...S file that looks fine when I open it using gedit , but when it's read by PHP (to merge all the CSS files into one), this CSS has the following characters prepended to it: 
...
Memcache Vs. Memcached [duplicate]
Someone can explain me the difference between Memcache and Memcached in PHP environment?
What are the advantages of one over the other?
Can you also suggest the criteria used to choose between one or the other?
...
How do I add 24 hours to a unix timestamp in php?
...add 24 hours to the timestamp for right now then simply you can do:
<?php echo strtotime('+1 day'); ?>
Above code will add 1 day or 24 hours to your current timestamp.
in place of +1 day you can take whatever you want, As php manual says strtotime can Parse about any English textual datet...
Mixing a PHP variable with a string literal
...ake a look to the Variable parsing - Complex (curly) syntax section of the PHP manual.
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Submitting a multidimensional array via POST with php
I have a php form that has a known number of columns (ex. top diameter, bottom diameter, fabric, colour, quantity), but has an unknown number of rows, as users can add rows as they need.
...
Configure WAMP server to send email
Is there a way that I can configure the WAMP server for PHP to enable the mail() function?
7 Answers
...
How do I implement basic “Long Polling”?
...rror 404 (to show error handling in the coming Javascript example)
msgsrv.php
<?php
if(rand(1,3) == 1){
/* Fake an error */
header("HTTP/1.0 404 Not Found");
die();
}
/* Send a string after a random number of seconds (2-10) */
sleep(rand(2,10));
echo("Hi! Have a random number: " . ...