I am having trouble finding out what the purpose of this semicolon is at for (; . My searches online have only brought irrelevant results. Can someone explain this please?
for (; $this->foo <=10; $this->foo++) {}
Asked
Active
Viewed 63 times
0
Dan
- 951
- 1
- 23
- 46
-
1It means the first clause is empty - there are no initialisations. Wait until you see `for(;;)` – Gem Taylor Nov 19 '19 at 13:53
-
It means that you don't want to initialize your variable. – Sunil Khatri Nov 19 '19 at 13:55
3 Answers
3
This basically skips the initializing of the iterator variable. Normally you'd type something like this:
for ($i = 0; $this->foo <= 10; $i++) {}
in your example however your object which is accessed by the $this simply accumulates the foo by 1;
cptnk
- 2,430
- 18
- 29
2
The first expression in a for loop is being executed at the beginnig of the loop, usually for initializing a variable.
In this for loop the expression is empty, so nothing is going to happen at the beginning.
Marce
- 467
- 1
- 6
- 10
2
For loop can work fine with for(;;) which is known as infinite loop.
It doesn't have any initialization part, no conditional checks and no post operation.
for(initialization, condition check, increment/decrement)
These are the 3 parts of for loop
Danyal Sandeelo
- 12,196
- 10
- 47
- 78