PHP syntax, there must be 1 $ before the variable name.
If, there are 2 $$, what does that mean?
What grammar is the equivalent of C language?
Reply to discussion (solution)
The variable of the variable.
Use the value of a variable as a variable name
$a = ' B ';
$ $a is equivalent to $b;
Use the value of a variable as a variable name
$a = ' B ';
$ $a is equivalent to $b;
What does it do in real programming?
Give an example!
$a = 1; $b = ' a '; echo $ $b; 1
Pointer equivalent to C
Maybe this "equivalent" will make you drill horns again.
$a = 1; $b = ' a '; echo $ $b; 1
Pointer equivalent to C
Maybe this "equivalent" will make you drill horns again.
No!
Learn the C language first, then learn the PHP language, some can not turn the bend.
Compare in two languages, but easy to understand PHP language!
$a = 1; $b = ' a '; echo $ $b; 1
Pointer equivalent to C
Maybe this "equivalent" will let you drill horns for a long time!
