Loop not generating the HTML

PHP
1 
<?php
for ($i=0; $i <4 ; $i++) {
	echo '<li class="list-group-item text-centre">'.  $features[i] . '</li>';
}
?>

What error I am doing the loop is not generating the HTML.

image

2

Try adding error checking instead of coding with blinkers/blinders :slight_smile:

<?php 
declare(strict_types=1);
error_reporting(-1);
ini_set('display_errors', '1');

for ($i=0; $i <4 ; $i++) {
	echo '<li class="list-group-item text-centre">'.  $features[i] . '</li>';
}
1 Like
3

For the benefit of others please cut and paste the errors and/or warnings that were generated.

Also note that error_reporting and ini_set(…) Should be set in PHP.ini otherwise errors and warnings will be displayed online and could possibly include sensitive data such as password, etc

1 Like
4

Do you see a problem here?

4 Likes
5

Ok. so now it throws an error:

**Notice** : Use of undefined constant i - assumed 'i' in I ended up defining it:

image
image860×362 17 KB

Notice : Use of undefined constant i - assumed ‘i’ in /home3/…/public_html/html…com/all/stripe/index.php on line 49

6

PHP variables are prefixed with the dollar sign and defined constants do not require the dollar sign.

The array parameter i is missing the dollar sign.

The PHP interpreter thinks i is an undefined constant.

1 Like
7 
$features[] = array("Feature 1", "Feature 2", "Feature 3", "Feature 4")

for ($i=0; $i <4 ; $i++) {
echo '<li class="list-group-item text-centre">'.  $features[i] . '</li>';

I am unable to understand error is still there.

8

Please help me get to the point sir.

9

Lets try it with crayons.
$features[i]
Do you see something missing here.

1 Like
10

Please wait. I did that before still errors we there. let me re-enforce.

11

Error checking in PHP is an iterative process. Jump the first hurdle, then reevaluate for the second. (IE: We can’t really help you solve problem #2 until you show us the error after you solve problem #1.)

1 Like
12

Fixed:

$features = array("Feature 1", "Feature 2", "Feature 3", "Feature 4")

for ($i=0; $i <4 ; $i++) {
echo '<li class="list-group-item text-centre">'.  **$features[$i]** . '</li>';

$[i] did the magic.

1 Like
13

I am pleased you managed to solve the problem.

Do you understand the generated error message?

2 Likes
14

Not fully. It was a hit and trial solution, which i know is not leading me anywhere without full comprehension of the subject. Cn you put some insight?

15

Read my post #6.

Let me know if you do not understand the difference between variables and defined constants.

1 Like
16

Yes, in general, I know that but what relevance do they have here?

17

In the original post the array parameter variable is missing the preceding dollar sign.

The PHP interpreter thinks the single i is a constant that has not been defined and generates the following error:

Notice : Use of undefined constant i - assumed ‘i’ in /home3/…/public_html/html…com/all/stripe/index.php on line 49

1 Like
18

Still confused so you want to establish that this should be:

$features[$i]
?

19

Try this and notice the difference:

<?php 
declare(strict_types=1);
error_reporting(-1);
ini_set('display_errors', '1');

define('i', 4);

$features = array(
  "Feature 1", 
  "Feature 2", 
  "Feature 3", 
  "Feature 4",
  'DEBUG  5 '
);

  for ($i=0; $i <=4 ; $i++)
  {
  // DEBUG START
    echo 'variable $i ==>  ' .$i  .'<br>';
    echo 'constant i  ==>  ' .i .'<br>' ;
    echo '<br>'; 
  // DEBUG FINISH

    echo '<li class="list-group-item text-centre"><b>'
        . 'CONSTANT: ' 
        .   $features[i] 
        . '</b></li>'
        ;
    echo '<li class="list-group-item text-centre"><b>'
        . 'VARIABLE: ' 
        .   $features[$i] 
        . '</b></li>'
        ;

    echo '<br>'; 
  }//

Edit:

Simplified fornext loop

1 Like
20

I’m wondering if common convention may be partly at fault. Typically variables begin with the dollar sign, constants are UPPERCASE. So it is intuitive that it is the uppercase that signifies a constant. This is not so. (rough descr.) It is the text not being inside quotation marks.

Kind of like PHP says “This is a text character but it isn’t in quotes so it isn’t text. It isn’t a token so I’ll assume it’s a constant.”

2 Likes