How to work with infinity arguments in a function (like PHP's isset())
15518
PHP function with unlimited number of parameters
34563
Why does PHP consider 0 to be equal to a string?
60338
Null vs. False vs. 0 in PHP
80608
JavaScript check if variable exists (is defined/initialized)
32293
What's the difference between if(!$variable) and if(isset($variable))?
134025
How to check if an array value exists?
29593
What is the "->" PHP operator called?
11286
Can a variable number of arguments be passed to a function?
19866
Is there a way to provide named parameters in a function call in JavaScript?
32232
How does the "&" operator work in a PHP function?
37436
In PHP, 0 (int, zero) is equal to "first" or "last" (strings)?
40229
How do I check if a variable exists?
60461
PHP variables in anonymous functions
76474
How to make a function that evaluates an expression?
24725
isset() function is returning true even when item is not set
102193
How do I get the function name inside a function in PHP?
129071
How can I break an outer loop with PHP?