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In PHP, a variable does not need to be declared before adding a value to it. PHP automatically converts the variable to the correct data type, depending on its value. After declaring a variable it can be reused throughout the code. The assignment operator ( = ) used to assign value to a variable.
A variable in PHP is a name of memory location that holds data. In PHP, a variable is declared using $ sign followed by variable name. The main way to store information in the middle of a PHP program is by using a variable.
global variables are stored in the $GLOBALS associative array. It will print "global" and then "local".
The $x (single dollar) is the normal variable with the name x that stores any value like string, integer, float, etc. The $$x (double dollar) is a reference variable that stores the value which can be accessed by using the $ symbol before the $x value. These are called variable variables in PHP.
I'm a PHP developer since many years but I don't know just one detail of how PHP handles variables and their types behind the scenes. I mean: in PHP - in theory - I could use the same variable to store an integer, and then a string, and then a boolean, and then an array... etc...
Personally, I loathe this way of "poorly-casted" programming, but I'm wondering how can PHP store and manage the variables and their types as I asked. I imagine the interpreter creates and handles C variables in behind, but I can't figure out how.
Thank you.
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