[SOLVED] newbie question about PHP

[nirvanaforu]

Hi there, I have a really simple question: how coud I print or echo the result of some arithmetric equations? what's the correct syntax?

For example:

<? echo "2+3";?> will output the string '2+3'

 

but if I have two variables $a and $b, which $a=2, $b=3

now <? echo "$a+$b"?> will output "2+3"

 

how could I get 5 except using another variable to store the sum first? Thanks

[revraz]

You are treating them as strings, you need to treat them as numbers.

[nirvanaforu]

Hi revraz:

  sure, I know that echo $a+$b without the double quote will work. However, if the string and numbers are mixed if there is some operator to that. For example:

<?

$a=1;

$b=2;

echo  "the sum is ". $a+$b . "\n";

?>

 

unfortunately, the '.' operator can't connect string with the result of numbers?

I don't want to use two echos to ouput this sentence. Do you know what I'm talking about? Thanks

[Xyphon]

Never start wiht <?, <?PHP is more secure, and blah blah. Just use it, and it can mess up in like, PHP 5, and such.

[nirvanaforu]

yes,  I'm using <?php ............?>  actually. Thanks

[revraz]

<?php
$a=1;
$b=2;

echo "the sum is " . ($a + $b);
?>

[Xyphon]

Also, use <?PHP, it might mess up when you have a big site if you dont O.O

[revraz]

Are you just spamming for posts?

[CMC]

Set the sum as a variable, like so. That will work for you

 

<?php
$a=1;
$b=2;
$sum = $a + $b;
echo  "the sum is: ".$sum;
?>

[/code]

[PFMaBiSmAd]

echo actually accepts a coma-separated list of operands, which will evaluate a term like $a + $b (tested) -

 

<?php
$a=1;
$b=2;
echo  "the sum is ",$a + $b,"\n";
?>

 

BTW: the short open php tag <? has nothing to do with php5. It was a lazy way short cut that has caused more problems then it was worth and results in code that is not portable between different server configurations and should not be used.

[nirvanaforu]

Thanks, man. That's what I'm looking for, coma , haha

however, as I just tested, print won't accept coma-separated lists. That's the only differences I know about print and echo now..

 

 

echo actually accepts a coma-separated list of operands, which will evaluate a term like $a + $b (tested) -

 

<?php
$a=1;
$b=2;
echo  "the sum is ",$a + $b,"\n";
?>

 

BTW: the short open php tag <? has nothing to do with php5. It was a lazy way short cut that has caused more problems then it was worth and results in code that is not portable between different server configurations and should not be used.

[Xyphon]

Are you just spamming for posts?

 

No. He said <?php is what he uses, <?PHP is more secure.

[revraz]

<?php and <?PHP are the exact same thing.