473,287 Members | 1,947 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,287 software developers and data experts.

diff between $x == null and is_null($x)

Is there a meaningful/usefull difference
between $x == null and is_null($x)?
Sep 18 '07 #1
0 1172

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
by: Marcus | last post by:
Hello, quick question about MySQL storing NULL values... Say I have a textbox called $_POST and a variable $var. if(empty($_POST)) $var = NULL; else $var = $_POST; Disregarding...
6
by: pam | last post by:
sorry for my poor english first. $notation=$rs->fields; if(!empty($notation)) echo $notation; the notation field in database is a text type, when the value is null, it will cause a mistake;...
4
by: Peter Croft | last post by:
I am a newcomer to php; I recently loaded a binary copy (5.0.3) onto my PC running win2k and Apache 2.0.52. It seems to work fine except that it is very slow running the function is_null e.g. the...
9
by: Ching-Lung | last post by:
Hi all, I try to create a tool to check the delta (diff) of 2 binaries and create the delta binary. I use binary formatter (serialization) to create the delta binary. It works fine but the...
64
by: yossi.kreinin | last post by:
Hi! There is a system where 0x0 is a valid address, but 0xffffffff isn't. How can null pointers be treated by a compiler (besides the typical "solution" of still using 0x0 for "null")? -...
13
by: Paul Lautman | last post by:
I have the following switch statement: switch ($record->sub_page) { case -1: $this->page = 6; $error_message = '<center>You appear to have already completed the form.</center>'; break; case...
1
by: Lennart | last post by:
diff -u /home/system/db2inst1/nya/bin/db2filter.py ./db2filter.py --- /home/system/db2inst1/nya/bin/db2filter.py 2007-01-12 15:23:34.000000000 +0100 +++ ./db2filter.py 2007-04-14...
9
by: arundelo | last post by:
Is there a way to tell whether accessing a variable will result in an "Undefined variable" E_NOTICE? isset() almost does this, but it also returns false if a variable is set to null: ...
7
by: rynato | last post by:
I have a lengthy 'markup.php' file which consists of functions which take as input the various attribute values of HTML tags and spit out the HTML tag. My problem is that the function for <inputis...
0
by: DolphinDB | last post by:
The formulas of 101 quantitative trading alphas used by WorldQuant were presented in the paper 101 Formulaic Alphas. However, some formulas are complex, leading to challenges in calculation. Take...
0
by: DolphinDB | last post by:
Tired of spending countless mintues downsampling your data? Look no further! In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
0
by: Aftab Ahmad | last post by:
So, I have written a code for a cmd called "Send WhatsApp Message" to open and send WhatsApp messaage. The code is given below. Dim IE As Object Set IE =...
0
by: ryjfgjl | last post by:
ExcelToDatabase: batch import excel into database automatically...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: Vimpel783 | last post by:
Hello! Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
0
by: ArrayDB | last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.