IF statements in PHP

antken · 09-16-2002, 09:13 AM

hi,

i am writing a simple function in php and it finds a name in a database if there is more than one result it returns a number if the database comes back with no results it returns another number but if it finds only one record then it returns the record number.

so far i have go it to return the number that is on the record in the database, now i have to make it more complex.

in m$ VB they have a IF statement that can work something like the following

Code:

IF foo = bar THEN 
blah

ELSEIF foo = blah THEN
boo

ELSE 
blah

my question is this:
does php's if statement do this as well? or do i have to do it another way?

verigoth · 09-16-2002, 12:18 PM

php uses C syntax:

if(foo==bar)
{
do this;
}
else if(foo==blah)
{
do that;
}
else
{
something else;
}

verigoth

ShawnD · 09-16-2002, 11:14 PM

you do not even need the {} things in PHP
here is a calculator program i made:
http://66.222.164.149/calculator.php
here is the source to it:

PHP Code:



<html>
<head>
<title>calculator program</title>
</head>

<body>
<div align="center">
<form action="<?php echo $PHP_SELF; ?>" method="POST">
<table width="650" cellspacing="1">
  <tr>
    <td>
      first number
    </td>
    <td>
      operator
    </td>
    <td>
      second number
    </td>
    <td>
      total
    </td>
  </tr>
  <tr>
    <td>
      <input type="text" name="first_number" value="<?php echo $HTTP_POST_VARS['first_number']; ?>">
    </td>
    <td>
      <input type="text" name="operator" value="<?php echo $HTTP_POST_VARS['operator']; ?>">
    </td>
    <td>
      <input type="text" name="second_number" value="<?php echo $HTTP_POST_VARS['second_number']; ?>">
    </td>
    <?php $total=$_GET['total'];
      if($HTTP_POST_VARS['operator'] == '+')
        $total = $HTTP_POST_VARS['first_number'] + $HTTP_POST_VARS['second_number'];

      elseif($HTTP_POST_VARS['operator'] == '-')
        $total = $HTTP_POST_VARS['first_number'] + $HTTP_POST_VARS['second_number'];

      elseif($HTTP_POST_VARS['operator'] == '*')
        $total = $HTTP_POST_VARS['first_number'] * $HTTP_POST_VARS['second_number'];

      elseif($HTTP_POST_VARS['operator'] == '/')
        $total = $HTTP_POST_VARS['first_number'] / $HTTP_POST_VARS['second_number'];

      elseif($HTTP_POST_VARS['operator'] == '%')
        $total = $HTTP_POST_VARS['first_number'] % $HTTP_POST_VARS['second_number']; ?>
    <td>
      <?php echo("<b>$total</b>"); ?>
    </td>
  </tr>
  <tr>
    <td>
      <input type="submit" name="submit_button" value="process it">
    </td>
  </tr>
</table>
</form>
</body>
</html>

as you can see, it does not have {} things in it yet it still works great

try it out plz, tell me what you think ehehe. it was originaly an assignment from my Practical C++ Programming book but i ported it over to PHP

(i hate compiling stuff!!!!)

no2nt · 09-17-2002, 08:53 AM

Word of caution:

Sure, you don't need to use a block {} for single line expressions but it
is not good practice to leave them out. I've seen more than enough problems
during debugging or maintaining code written by junior programmers in our
organization who do not use {}.

antken · 09-17-2002, 09:02 AM

i have too done this, i had an if statement saying basically if your browsing our website from the inside it generates a link to an internal machine, but if your outside it links else where.

thing is, cos i missed out the {} i was getting two links.

but thant for mentioning it !

thanks

--antken
_______________________
and dont for get the ;

ShawnD · 09-17-2002, 09:21 AM

you mean if i had something like this?

Code:

if(joe=='happy'){
  echo("joe are so uber l337");
  
  else
    if(joe=='not_happy')
      echo("joe ain't happy");
}

without the {} would it treat this as the second if statement being non tied into the else?

antken · 09-17-2002, 09:38 AM

yes,

basically i had what you had above, but after the if statement i had a few other things to do
for example

Code:

if (laa = deedaa) 
     dothis
     do that
     and this

else 
   jump
   eat_the_apple

so above, if laa does equal deedaa then it will process: dothis, do that, and this, and eat_the_apple

but if laa equals something else then php will process: do that, and this, jump, and eat_the_apple
but will not process dothis

including the {} like so:

Code:

if (laa = deedaa) {
     dothis
     do that
     and this
}
else {
   jump
   eat_the_apple
}

then else will process everything inside its brackets and the if will process everything inside its brackets

this was my problem a few days ago i kept forgetting the {} and thus messing my coded up

--antken
_______________________
and dont for get the ;