CODEWITHSUNDEEP
php
mrpatg
mrpatg

Reputation: 10117

Value of variable changing before function is finished running

I have an image uploading script in which i use the following setup to assign names to uploaded images;

        $saltdate = date( 'U' );
        $saltuser = $_SERVER[REMOTE_ADDR];
        $saltname = md5($saltdate.$saltuser);

// Recieve, Process, Save uploaded image

// Update database with image name

The problem that i encounter is that after processing/saving the image, when its time to add this file name to the database, the value of $saltdate seems to have changed and i will get a file name in the database that doesnt exist.

EDIT

The value has changed in that the time increases from when i name the file to when i store the name in the DB.

How can i make sure that the value doesn't change once i establish it?

Upvotes: 0

Views: 146

Answers (3)

VolkerK
VolkerK

Reputation: 96159

This is the kind of error where a debugger comes in really handy. You can set a breakpoint in your code and then execute it step by step and inspect the state of variables et al.

You can use XDebug as the server-side php module and e.g. netbeans as a frontend/ide.
There's a short introduction for this combination at http://netbeans.org/kb/docs/php/debugging.html

Upvotes: 1

Sarfraz
Sarfraz

Reputation: 382686

Since you are using the md5() function, make sure that you are doing the same thing while retrieving the record back. Notice that you are using a date in your salt, make sure that things match up.

An easy way is to use microtime function instead.

Upvotes: 1

jake the snake
jake the snake

Reputation:

Set it as a constant with define

Upvotes: 1

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