[SOLVED] For Loop?

[Lamez]

Is there a way where the user can input a number, and that is how many images come up?

 

example: the user inputs 100 in a text field, then the script loads up 100 images.

 

Now I am just using images for an example.

 

How would I do that, a for loop, and if so can I get an example, I am not good with loops.

[revraz]

http://www.tizag.com/phpT/forloop.php

[Lamez]

That kinda helps. I still do not understand it.

[revraz]

In the example in the link

 

for ( $counter = 10; $counter <= 100; $counter += 10)

 

you are doing the code in this loop:

 

starting your counter at 10, up to 100, incrementing by 10

 

Just play with it and change it and see what it does.  You have to try things to learn them.

[Lamez]

ya I was messing around with the code after I said that. It makes a lot more sense after you explained it.

 

Thanks!

[Lamez]

ok so I have another question

 

I use this:

<?php
for ( $counter = 99; $counter <= 100; $counter += 10){
echo "<BR>YA YA<BR>";
}
?>

 

but I only got one result.

 

Why?

[lemmin]

That loop increments $counter until it is equal to 100 and since you start $counter out at 99, it only takes one increment to get to 100. If you want 100 loops, set $counter to 1 at first.

[kenrbnsn]

Because you're starting the loop at 99 and ending the loop when the counter is greater than 100 -- which occurs at the start of the second loop.

 

Ken

[Lamez]

so I am understanding it now.

 

would this get me 100 results?

 

<?php
for ( $counter = 1; $counter >= 0; $counter += 0){
echo "<BR>YA YA<BR>";
echo $counter;
}
?>

[revraz]

for ( $counter = 1; $counter <= 100; $counter++)

       ^^^ Start #   ^^^^^^ End #

[revraz]

Maybe this is easier

 

http://us3.php.net/for

[Lamez]

I read it, but it all says the same thing.

 

I am trying to learn

 

ok I am getting tons of results

 

I used this code:

<?php
$num = 0;
for ( $counter = 1; $counter = 5; /*$counter += 0*/){
$num+=1;
echo $num."<br>";
}
?>

 

and I am getting thousands and thousands results, and it is not stopping.

 

Here is a link: http://links.krazypicks.com/test.php

[revraz]

for ( $counter = 1; $counter <= 5; $counter++){

 

[nrg_alpha]

The simplest way to see this is as the need to start some variable, then increment it till it reaches a certain point, then the loop stops..

 

for($i = 0; $i < 100; $i++){
  // do something..
}

 

So bascially, we setup a variable ($i) and set it to zero: $i = 0;

next, the loop is setup to have a stopping point: $i < 100; so think of this as being, while $i is less than 100, do the last bit,

and that last bit is: $i++ which is the same as saying $i = $i + 1.

 

So, while $i is less than 100 (99 or less obviously), do what is inside the curly braces and increment it by 1 and continue with the loop.

This is a very common setup and works well. So say you only need to loop 50 times, juts change the < 100 to < 50.

 

Incase you were wondering why $i typically is set to 0, it's just a way to make the limit (in the above code snippet, 100) nice and tidy.. If I started $i at 1, and I needed 100 loops, the limit would have to be set to 101. so keeping things starting at 0 is... simpler.. (indexed arrays also work this way.. they start at 0 and work upwards).

 

Hope that helped.

 

Cheers,

 

NRG

 

[kenrbnsn]

There are 3 arguments to the for loop

1) start value

2) end condition

3) increment

 

you made an infinite loop

Your start value is ok -- 1

Your end condition is not a condition but an assignment statement which is always true

You don't have an increment.

 

Your example correctly written:

<?php
$num = 0;
for ($counter =1; $counter <= 5; $counter++) {
    $num++;
    $echo $num. '<br>';
}
?>

 

Ken

[Lamez]

Thank you guys, I understand it very clear now!

 

[Lamez]

 

 

Your example correctly written:

<?php
$num = 0;
for ($counter =1; $counter <= 5; $counter++) {
    $num++;
    $echo $num. '<br>';
}
?>

 

Ken

 

Ken you set echo as a variable.

 

We all make mistakes!

[Andy-H]

$echo??? Lmao

 

<?php

$counter = (int)$_POST['counter'];

for ($count = 1; $count < $counter; $count++){

echo number_format($count)." <br />";

}

echo "Finished loop!!!";

?>

[Lamez]

I made a little script using a form, like I wanted:

http://links.krazypicks.com/test.html

[Andy-H]

Input: 7

 

Output: Fatal error: Call to undefined function getFileExtension() in /mounted-storage/home48c/sub007/sc33591-LWQU/link_check/upload.php on line 26