Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

PHP PHP Arrays and Control Structures PHP Loops For Looping

Taylor Murray
Taylor Murray
4,611 Points
Posted by Taylor Murray
Taylor Murray
4,611 Points

For Loops, Challenge 1 of 2.

I'm supposed to print each number 1 through 100, including one hundred. At each of the facts' number, I'm supposed to print the fact with it. I keep getting the errors "Does not end at 100" or "I do not see all the numbers between 1 and 100."

I've looked up other solutions posted, but they're using functions I've not been taught yet.

index.php 
<?php
$facts = array(
    57 => ' on Heinz ketchup bottles represents the number of varieties of pickles the company once had.',
    2 => ' is the approximate hours a day Giraffes sleeps',
    18 => ' is the average hours a Python sleeps per day',
    10 => ' per cent of the world is left-handed.',
    11 => ' Empire State Buildings, stacked one on top of the other, would be required to measure the Gulf of Mexico at its deepest point.',
    98 => '% of the atoms in your body are replaced every year',
    69 => ' is the largest number of recorded children born to one woman',
);
//add your loop below this line
for ($i = 0; $i < 101; $i++) {
    echo $i . $facts[$i] . "<br />\n";
}

2 Answers

Matthew Bilz
Matthew Bilz
15,829 Points

Serhii has it nailed - but if you're in the beginning stages, here's what I would say:

Here's what your loop should look like:

for($i = 1; $i <= 100; $i++) {
  if(isset($facts[$i])) {
    echo $i . $facts[$i];
  } else {
  echo $i;
  }
}

The isset function is checking to see if there is a match for the numerical key value for wherever $i is at in the loop at that time. If it finds a match, we echo out the number, THEN the value of the array item as per the instructions. Otherwise, if the $i value is not part of the array's keys, it skips over the first statement and heads directly to your else statement to echo out simply $i. I hope this helps!

Taylor Murray
Taylor Murray
4,611 Points
Taylor Murray
Taylor Murray
4,611 Points

Thanks very much! I didn't quite understand the isset function. This is very helpful!

Serhii Lihus
Serhii Lihus
6,352 Points
Serhii Lihus
Serhii Lihus
6,352 Points

Hi there Taylor!

Everything except 0 and there must be 100 at the end. This what task is saying. ;)

for ($i = 1; $i <= 100; $i++) {
    echo $i  .  "<br />\n";
}

But if you want to output array value, always check if there is such element in the array before outputing it.

for ($i = 1; $i <= 100; $i++) {
    echo $i . (isset($facts[$i]) ?  $facts[$i] : '') . "<br />\n";
}

Best regards.

Taylor Murray
Taylor Murray
4,611 Points
Taylor Murray
Taylor Murray
4,611 Points

Thanks for the response. It's very helpful!