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PHP short-ternary ("Elvis") operator vs null coalescing operator
Can someone explain the differences between ternary operator shorthand (?:) and null coalescing operator (??) in PHP? When do they behave differently and when in the same way (if that even happens)...

syntax - What does "->" or "=>" mean in PHP? - Stack Overflow
since PHP 7.4 => operator is also used for the arrow functions, a more concise syntax for anonymous functions. since PHP 8.0 => operator is also used to define hands in the match expression

What's the difference between :: (double colon) and -> (arrow) in PHP?
The difference between static and instantiated methods and properties seem to be one of the biggest obstacles to those just starting out with OOP PHP in PHP 5. The double colon operator (which is called the Paamayim Nekudotayim from Hebrew - trivia) is used when calling an object or property from a static context.

syntax - What are the PHP operators "?" and - Stack Overflow
As of PHP 5.3: Since PHP 5.3, it is possible to leave out the middle part of the ternary operator. Expression expr1 ?: expr3 returns expr1 if expr1 evaluates to TRUE, and expr3 otherwise. As of PHP 7.0 PHP 7 has new Null Coalesce Operator. This is the same as a ternary but is also called an "isset ternary".

What does "=>" mean in PHP? - Stack Overflow
Arrays in PHP are associative arrays (otherwise known as dictionaries or hashes) by default. If you don't explicitly assign a key to a value, the interpreter will silently do that for you.

What does ${ } mean in PHP syntax? - Stack Overflow
${ } (dollar sign curly bracket) is known as Simple syntax. It provides a way to embed a variable, an array value, or an object property in a string with a minimum of effort. If a dollar sign ($) is encountered, the parser will greedily take as many tokens as possible to form a valid variable name. Enclose the variable name in curly braces to explicitly specify the end of the name.

How do I get PHP errors to display? - Stack Overflow
However, this doesn't make PHP to show parse errors occurred in the same file. Also, these settings can be overridden by PHP. In these cases the only way to show those errors is to modify your php.ini (or php-fpm.conf) with this line: display_errors = on (if you don't have access to php.ini, then putting this line in .htaccess might work too):

Reference assignment operator in PHP, =& - Stack Overflow
The PHP manual has a section titled References Explained which every PHP programmer should read. It's important to understand that references in PHP are not a data type, like a pointer, but a concept regarding how variables work.

Format code command for PHP/HTML in Visual Studio Code
Is it possible to get Visual Studio Code to format mixed HTML and PHP code on Windows Visual Studio Code version 0.7.1?

How to set PHP executable path php.validate ... - Stack Overflow
Question is How to set php executable path php.validate.executablePath in vscode when php is set inside docker container? My understanding is that docker runs containerized applications (like guest/virtual machine but with less resources.