For Loops in PHP
Writing Your First 'For' Loop

Great work! Now let's put together our first for loop from start to finish.

A for loop that prints out the numbers 1 through 10 might look something like this:

for ($i = 0; $i < 11; $i++) {
    echo $i;

This for loop counts up by 1 each time, all the way to 10.

You could change the third part of the for loop so that it counts up by 5 instead, like this:

for ($i = 0; $i < 11; $i = $i + 5) {
    echo $i;

Instead of $i++, we have $i = i + 5 to count up by 5, all the way to 10.


Write a for loop that counts up by 10, all the way to 100 (e.g. 10, 20, 30...). Inside the for loop, echo the current value of $i, just like in the examples above.

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Your code should look something like this:

for ($i = 0; $i < 101; $i = $i + 10) {
    echo $i;

Be very careful when constructing your loop—in particular, make sure your loop is written with conditions that will allow it to end!

For instance, if you type $i + 1 instead of $i++ or $i = $i + 1 for the third bit of your for loop, the $i variable will never actually get updated, and your loop will go on forever. This is called an infinite loop and it will cause you to have to refresh the page. Beware!

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