Subtraction Of 2 Variables


Aug 26, 2007

I sound a bit noobish here but is this how you structure a subtraction of 2 variables to equal a new variable:

$FreeRooms = (($TotalRooms) - ($HouseLodgerTotals));

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Decimal Subtraction...

I'm try to test a variable sent from a form to see if its between .10 and $50 and make sure that it's not something like 1aaaa or a word. Here's what I have so far and it works fine on the > 50 part but I can't figure out why it doesn't work with a decimal. PHP Code:

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Date Subtraction?

If I have the below dates how can I subtract to get the number of days?

$enter_date = 2006-01-01;
$complete_date=2006-03-01;
$total_days= $complete_date - $enter_date;

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Date Subtraction

Is there a php function to determine the difference between dates.

I'd like to take a birthdate and then determine how old a person is dynamically and simply return the age in years.

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Subtraction Time

i have a variable. it has one time. (this varibale gives it's data from database)

echo $variable // print: 18:04:20

i want to subtraction 5 minutes from this variable what should i do, in this example this variable should print: 17:59:20.

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Calculation - Addition Subtraction Operation - Not Accurate Result

calculation - Addition Subtraction Operation - Not Accurate Result

<?php
echo 199.8 + 0.9 -200.7; //expect 0, result 2.8421709430404E-14 ?
?>
Tested on PHP Version 5.3.2-1 ubuntu4.7

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Fatal Error Unsupported Operand Types In (when Using Subtraction)

I am getting this error when trying to subtract one value from another to create a new value to return to a database.

Code:
/* Get the currQty of Inventory item and set it as old Take off used stock and post back to the database table invitems*/
$oldQty=$row_Recordset2['currQty_invItem'];
$usedQty=$_GET['qty_servInv'];
$newQty= $oldQty - $usedQty;
endCode:

The error is on the last line.

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Storing DateTime In MySql And Performing Subtraction To Get Difference In Days And Hours

I googled a bit but I cannot figure out how to use DateTime function and store in MySql using PHP. Also I need to subtract the stored date in the database from current date, and also stored time from current time.

I don't wish to use separate date() and time() function. I wish to store both date and time in one column in MySql using PHP and get individual result of subtraction of date and time. How can I achieve this?

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Functions Can Recognize My Global Variables Without Sending These Variables As Parameters In The Function Headers?

If I define a variable $var, and then define a function Func(), then I can't use the variable $var inside the function because the variable is defined outside the function. If I want to use the variable $var inside the function, then I have to send it as a parameter in the function header like this, Func($var).

But the problem is that I have many global variables, and many function. I don't want to pass all these variables to all the functions! Isn't there a way that the functions can recognize my global variables without sending these variables as parameters in the function headers?

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Http Headers - Send Redirect Page Pass Variables As Post Variables From A Script?

you can find a similar question here PHP Post Request inside a POST Request but this is not working in my context. I have a form (reservation form for a tour website) and when the form is submitted, the values are processed in a script like validation and calculation of values and sending email. after processing the variables, i want to send it to a page for payment and this page will post payment details to paypal.

My question is after the reservation form is submitted, after processing values retrieved from reservation from, how can i redirect the page in such a way that the variables will be passed as post variables. (I am not looking from response from the other form, i want to redirect to the other form).

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Variables Not Holding / Variables From The Previous .php Script Dont' Transfer Over?

I have a .php script with 2 variables. $company and $user. During this .php script I require_once "/var/www/etc/etc/etc/etc/"

The .php file that I require_once, the variables from the previous .php script dont' transfer over. I can't figure out why, or what I am doing wrong. Ex.

master.php script

$company = "Some Company";

$user = "John";

require_once "/var/www/$company/$user/example.php

example.php script

$myFile = "/var/www/$company/$user/Template/Download/example.php";

The data that is held in the variables $company & $user doesn't hold through on the example script. I can't understand why.

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Regex - Passing Variables To Perl - Using Spaces Between Variables Method?

i had been using this method to call perl (before i started trying to do this with regular expressions).. passing in a regex string as a variable causes all sorts of problems, such as using " ( )" anywhere makes it not work, among other things.. I am wondering if there is a better way to do this, than the string of variables after the perl filename method as it seems to have some glaring limiations.

the way I do it currently:

$file = "/pathtomy/perlscript.pl $var1 $var2 $var3" ;
ob_start();
passthru($file);
$perlreturn = ob_get_contents();
ob_end_clean();
return $perlreturn;

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Linux - Testing Two Double-variables Gives Different Result Without Changing The Variables?

in my code i have two double values. Lets call them $a and $b. now I want to test which one of them is larger, so I wrote the following:

print ($a > $b ? "larger
" : "smaller
");
print ($a > $b ? "larger
" : "smaller
");

does anybody encountered a similar problem before? This problem only appears on our embedded linux system using php-cgi.

Here is the whole code: I need to decode a hex value into a decimal value regarding the sign and eventually useng numbers larger than the integer-size

[Code]...

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Assign Variables To The Value Of The Post Variables Using The Field Names?

I’ve been using an older version of PHP up until recently. Using the older build I had 'register_long_arrays' on. However this depreciated some time ago and I want to start working with 'register_long_arrays' set to off.

My question is; if, for example you have a form with 25 fields is there a quick way assign variables to the value of the post variables using the field names? Code:

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Setting Variables Ahead Of Time With Gobal Variables

I just obtained a book that teaches you how to use php to handle form info. I created the example form as well as the php script to handle the form input. But when I run the form the $name(Variable) and $email(Variable) will not populate. I tried setting variables ahead of time with gobal variables, but didn't work. Ex.

$name=$_post['name']
$email=$_post['email'].

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Convert $_GET Variables To Regular Variables? About 10 Times

Do you guys always convert your GET and/or POST variables to regular variables $variable = foo;? On a page, I'm using a GET variable about 10 times, would it be more efficient to convert it to a regular variable (I'm sure there's a name for this type of variable) at the beginning?

Does it have anything to do with load on the PHP (interpreter, like it goes to check the variable from the URL every time, which is maybe more of a strain than from the document itself), or just mere file size?

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Funny Behaviour Of Cookie Variables And Session Variables?

I wrote a little PHP script below to demonstrate my question. Run the code below like this:[URL]You will see that the number echo'ed to your screen is always 1 digit behind the url number?! Maybe because I cant a cookie and immediately read the same cookie?

//If query string has $test, store in session, and cookie for later.
if($_GET[test]){
$_SESSION['test'] = $_GET[test];
setcookie("test", $_GET[test], time()+60*60*24*30*12*10); //10 years
}
//If user comes back later, then get $test from cookie
if (isset($_COOKIE["test"])){.......

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Class Design - Variables In Array Instead Of Distinct Variables?

I'd like some suggestions/critique/opinions on the following setup of class "bar". Both classes "bar" and "foo" hold the same data and do the same stuff, the difference being that in one case data is held in an array whereas in the other there are distinct variables. Is there anything fundamentally wrong with that approach that would make you say "I would never do that"? Obviously it's not easily possible to convert the variables in the array to "public" - but I do not intend to do so - I prefer using accessors and mutators for exposing class variables.

The advantage that I see is that I can build a "lazy" constructor where I can simply fill the whole class-data in one swoop - for example from an array that I got through a datareader class that retrieves them for me from a DB.

[Code]...

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Change PayPal Posted Variables Into Local Variables?

How can I change PayPal posted variables into local variables? I just want to echo out the amount in my page. And I want to send visitors to my page directly when they click paynow button I want to skip other step. Now paypal show the 2 links 1 is go to my site and 2 is paypal account overview when they hit the paynow button. i dont want to show those links. Here is my code:

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="joyson_1310654220_biz@hotmail.com">

[code].....

my page code

<?php
$amount = $_POST['amount'];
echo $amount;
?>

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Call Private Variables And Var_dump() Shows Three Variables?

var_dump() shows all three variables, but can't seem to call them directly.

PHP Code:abstract class FormInput
{
private $_value = "value";
private $_name = "name";

[code]...

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Same Named Variables.. Or Addressing Variables In A Loop

I'm just starting to program in PHP.. fairly new to programming in general... and I've run across a (probably simple) programming problem I hope someone can help me with. I'm sending variable names through an HTTP get that are generated through a foreach loop. The names are along the lines of name1=, begin1=, end1=, name2=, begin2=, end2=.. etc. The number is the number of the current cycle through the loop. My problem is addressing the variables on the next page... namely how do I evaluate those variables in a loop? I want the value of name1.. but obviously

for (i=1; i<3; i++)
{
echo "$name$i";
};

is not working. Is there an easy way to do this?

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Converting Post Variables Into Session Variables

I have a script in which I take a whole lot of data from a number of pages of a form, compile it into one, and let the user edit it before it's eventually thrown into a SQL database. The data coming from the forms is in post, and I've created arrays of all of the fields in the form, like: Code:

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Get New Variables Added To Previous Variables On Page?

My question is, in other words, how can I get new variables added to previous variables on the page? Imagine this being [URL] but after submitting this form it'll go to [URL] What I would expect would be: Imagine this being [URL] How could I resolve this?

[Code...]

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Passing Variables To A WCF Web Service - Variables Are Blank

I have a WCF Service, the interfaces work fine when connecting with a c# application but when I connect using a PHP application all variables passed to the service are null.

This is the PHP code used to connect to the service and send the data.

$SelectedFolder = $_REQUEST['folder'];
var_dump($SelectedFolder);
try
{

[Code]....

The var dump displays the following

string 'Pictures/Sample/' (length=16)

This is the service code

[OperationContract]
List<VersionedFileDataModel> GetAllLatestVersionsString(string partUri);

I've tried passing a static value instead of a variable and both times the value received by the service is null.

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Session Variables Lost Between Pages Or Use Same Variables?

I have Wamp Server(2.2.11) with PHP(5.2.9.-2). I know I did something wrong but I didn't find myself.Before I wrote this e-mail I red many document with different search items. I test a same application with different User IDs. When I use "session.use_cookies = 0", session variables lost between pages for SAME UserID. When I use "session.use_cookies = 1", same session variables are used DIFFERENT User IDs.

My php.ini's session settings at below:

[Session]
session.save_handler = files
session.save_path = "c:/wamp/tmp"

[code]....

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Session Variables Interchanged With Local Variables?

I've encountered a very odd issue in regards to session variables and local variables in php. if I am not understanding something about sessions in php or if this is an issue with the php version my host is using.Here is a very simple code to demonstrate the weird issue:

session_start();
var_dump($kenny);
var_dump($_SESSION['kenny']);
[code]....

It looks to me like the session variable 'kenny' and local variable $kenny become aliases to one and the other after running the script more than once. hmm... I really don't think this is how session variables and local variables work in php.My web host is running php 5.2.2. When I try this exact same code on other hosts running php 5.2.1, 5.2.14 and 5.3.1, they always give me what I expect:

1st time:NULL NULL NULL string(3) "def" string(3) "abc" string(3) "def"

thereafter:

NULL string(3) "def" NULL string(3) "def" string(3) "abc" string(3) "def"

I checked the change log on php.net and didn't find anything that I can relate to that may address this issue. But like I mentioned, an earlier build (5.2.1) works ok, so that's very puzzling to me.If anyone runs any other version of php 5.2.x, please give it a try and let me know if you see the same issue.

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