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What does $$ (dollar dollar or double dollar) mean in PHP?
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It's a variable's variable.
<?php
$a = 'hello';
$$a = 'world'; // now makes $hello a variable that holds 'world'
echo "$a ${$a}"; // "hello world"
echo "$a $hello"; // "hello world"
?>
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Fastest method to replace all instances of a character in a string [duplicate]
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Try this replaceAll:
http://dumpsite.com/forum/index.php?topic=4.msg8#msg8
String.prototype.replaceAll = function(str1, str2, ignore)
{
return this.replace(new RegExp(str1.replace(/([\/\,\!\\\^\$\{\}\[\]\(\)\.\*\+\?\|\<\>\-\&])/g,"\\$&"),(ignore?"gi":"g")),(...
Laravel Check If Related Model Exists
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In php 7.2+ you can't use count on the relation object, so there's no one-fits-all method for all relations. Use query method instead as @tremby provided below:
$model->relation()->exists()
generic solution working on...
What is the point of interfaces in PHP?
... concept of an 'interface' from the concrete interfaces in a language like PHP? Any function, for instance, has an "interface" which defines how you use it and hides its implementation. So that kind of "contractual" interface doesn't require a special language feature. Therefore the language feature...
Any recommendations for a CSS minifier? [closed]
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I like Minify. In PHP and works with CSS or JavaScript.
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URL encoding the space character: + or %20?
...s is not very consistent across languages, though.
If I'm not mistaken, in PHP urlencode() treats spaces as + whereas Python's urlencode() treats them as %20.
EDIT:
It seems I'm mistaken. Python's urlencode() (at least in 2.7.2) uses quote_plus() instead of quote() and thus encodes spaces as "+".
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Which characters are valid in CSS class names/selectors?
...ger's comment over two years later, according to w3counter.com/globalstats.php IE6 is now used by less than 3% of users, behind IE9 on 4%, IE7 on 9%, IE8 on 22%. All versions of Firefox have 28%, all versions of Chrome have 17%.
– Daniel Earwicker
Jun 15 '11 at...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...。
Service和Characteristic则是比较重要的，Service可以理解为PHP中的“类”、功能对象的集合。Characteristic可以理解为PHP的“函数”，是GATT中具体的功能对象，每个Service都可以包含一个或多个Characteristic（特征）。Characteristic是GATT pr...
Determine the line of code that causes a segmentation fault?
...nuces - Google around. For Arch Linux, read this wiki.archlinux.org/index.php/Core_dump
– Mawg says reinstate Monica
Jan 24 '17 at 16:35
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Laravel Eloquent: Ordering results of all()
...sorting the collection with sortBy() happens inside the Laravel Engine (in PHP), while the orderBy() is done in the database. Surely the database is going to be quicker in almost all conceivable situations, and as your dataset increases so will the disparity in performance. I'd love to hear other pe...