Tutorial 20: For Loop

For Loops are a little trickier to wrap your head around, so hang in there!

The for loop is used when you know in advance how many times the script should run. — w3schools

The syntax looks like so:

for (initialize counter; test if TRUE; increment counter) {

	// execute code

}

Essentially, the For Loop will:

1. Initialize where the loop will start counting by adding a value to a variable
2. Evaluate a certain condition to test if the condition is either TRUE or FALSE (if the condition is FALSE, the loop will stop running)
3. Increment the value by 1 each time we loop through

So, if we want to have our For Loop spit out the numbers 0 to 20, we would code the following:

for ($a = 0; $a <= 20; $a++) {

	echo "Number: $a 
";

}

If coded correctly, this code should echo the numbers 0 to 20 on your screen, and stop at 20.

Feel free to experiment with the above For Loop with some PHP using the practice.php page provided in this folder.