Calling an array position by variable. HOW?

[paul-scream22]

OK, bassically I want to be able to grab an array value like :

$array[2];

But my script will grab the array position NOT by a static number but from a variable that increments :

i.e

$count=4;
while ($count != 0) {
$array[$count];
$count++;
};

But this DOES NOT work :mad:

For more info -

I am using JpGraph to create a line graph from data in a coma seperated file. Now it's all set up perfectly and is exploding the file and putting each line of data into a ydata# variable depending on how many lines.
The problem is that the call to plot the line :

$lineplot->SetColor("red");
$lineplot->SetWeight(2);

Is looping round and creating all red lines.
I need to create each lineplot of a different color!

So I created an array :
and then :

$colors = array(red,blue,black,green,orange,pink,brown);
$count = 4;
while ($count != 0) {
${"lineplot$count"}->SetColor($colors[$count]); << [b]Doesn't work[/b]
${"lineplot$count"}->SetWeight(2);
$count4--;
};

But PHP/JpGraph says "invalid colour" :eek:

Now if i do :

$count = 4;
while ($count != 0) {
${"lineplot$count"}->SetColor($colors[2]);[b]Works[/b]
${"lineplot$count"}->SetWeight(2);
$count--;
};

I get all the lines in black so the array IS WORKING, but i CANNOT reference the array through a variable!

So what syntax do i need to get PHP to take the literal value of the variable?

I hope you can understand what I'm trying to achieve, and that you can help me out. Thanks!

######Edit
I tried -

$colors[] = $count;

and

next( $colors );

But that didn't work, and have used the search function but not found a similar thread!
Surely some-one must need to reference an array with a variable?

[bubblenut]

<?php
$colors = array(red,blue,black,green,orange,pink,brown); 
$count = 4; 
while ($count != 0) { 
${"lineplot$count"}->SetColor($colors[$count4]); << Doesn't work 
${"lineplot$count"}->SetWeight(2); 
$count4--; 
}; 
?>

You have set $count to 4 and then you are trying to use the variable $count4 which has never been set
try rewriting like this

<?php
$colors = array(red,blue,black,green,orange,pink,brown); 
$count = 4; 
while ($count != 0) { 
${"lineplot$count"}->SetColor($colors[$count]); << Doesn't work 
${"lineplot$count"}->SetWeight(2); 
$count--; 
}; 
?>

HTH
Bubble

[paul-scream22]

sh*t - that was a typo :mad:

SORRY :o

I've tried nmerous ways to reference the variable within the [] but php does not accept it.

$colors[3]; --> WORKS

$colors[$count]; --> DOES NOT WORK!

[bubblenut]

$colours[$var]; Is correct syntax. Double check that the array does hold the data you expect it to and also that the variable is holding the data you expect it to. ie whack in a load of echo statements so you can see exactly what's going on in there.
HTH
Rob

[bubblenut]

Aha! I think I may have spotted it.
In your array declaratio you have no inverted commas around your colour names, rewrite as

$colors = array('red','blue','black','green','orange','pink','brown');

Hope this is it
Bubble

[paul-scream22]

@ bubblenut.

You're right!

Unfortunatley the code does NOT work in my graph PHP file 🙁

I did this :

<?php
$colors = array('red','blue','red','pink','orange');
$count = 4;
while ($count != 0) {
echo $colors[$count];
$count--;
};
?>

And it echoed the array.

But within my JpGraph php file I have this :

$colors = array('red','blue','black','green','orange','pink','brown');
$count = 4;
while ($count != 0) {
${"lineplot$count"}->SetColor($colors[$count]);
${"lineplot$count"}->SetWeight(2);
$count--;
};

And it still results in an unkown color specification error.

So alas it looks like a JpGraph problem :mad:

Back to the drawing board, not sure what to do really, as I have 10+ lines on this graph all in the same color!

I need to be able to dynamically change the color assignment everytime it loops round.

I think maybe posting on the JpGraph forums. Thanks for your help!

If any-one can think of a solution you would be a god 😃