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How do the PHP equality (== double equals) and identity (=== triple ...
PHP Double Equals == equality chart: PHP Triple Equals === Equality chart: Source code to create these images: PHP equality charts Guru Meditation Those who wish to keep their sanity, read no further because none of this will make any sense, except to say that this is how the insanity-fractal, of PHP was designed. NAN != NAN but NAN == true.

PHP short-ternary ("Elvis") operator vs null coalescing operator
The PHP 7.0 migration docs has this to say: The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset ().

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

Start learning PHP — Useful resources for beginners and advanced
Start learning PHP — Useful resources for beginners and advanced! If you're wondering where to start from learning the PHP language or needing some more knowledge to deep dive into the language, you are on the right place! I want to share with you some links with useful materials to start learning. All you need is the motivation to learn and go ahead!

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".

syntax - What does '
26 Since it wouldn't add any value to repeat that it means echo, I thought you'd like to see what means in PHP exactly:

Reference Guide: What does this symbol mean in PHP? (PHP Syntax)
What is this? This is a collection of questions that come up now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list. This qu...

What is the use of the @ symbol in PHP? - Stack Overflow
Like already some answered before: The @ operator suppresses all errors in PHP, including notices, warnings and even critical errors. BUT: Please, really do not use the @ operator at all.

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.

php - Logical Operators, || or OR? - Stack Overflow
I remember reading a while back in regards to logical operators that in the case of OR, using || was better than or (or vice versa). I just had to use this in my project when it came back to me, b...