Four characters in PHP

rsasalm

Hi all,

These four characters " ' \ and null in PHP makes me very confused.
Can some give me explain these with simple examples or give me poiniter to some simple tutorial which explains the difference with examples.

thanks
regards
/rsasalm

laserlight

It might be better if you explained what confuses you.

Rodney_H_

Hi, I am not sure what exactly is confusing you about them, but I remember when I was just starting out a little while ago, i was confused by escaping strings, and a feature called magic quotes, etc...

A couple of tutorials about strings, and escaping them are:

http://codewalkers.com/tutorials/45/17.html

http://www.webmasterstop.com/63.html

I hope these help. The second article I found reading these forums here! 🙂

rsasalm

Hi again,

Here comes an example which cofuses me regarding ' and " characters. I have a dirctory photos which lies where test.php script lies and under photos dir, there is a file 24.jpg

<?php

$images_dir = "photos";
$filename = "24.jpg";
echo "<br>";
echo '".$images_dir. "/tb".$filename."';
echo "<br>";
echo "<br>";
echo "<img src='".$images_dir. "/tb".$filename."' /> File";
?>

The output is as follows:
".$images_dir. "/tb_".$filename."

and a 24.jpg picture in the brower appears.

My question is why I don't see the real values of variables when I echo those but in
echo "<img src='".$images_dir. "/tb_".$filename."' /> File";
these variables are replaced with real values and I can see the picture.
thanks
regards
/rsasalm

laserlight

It will become clear after you read the PHP Manual's entry on strings.

thorpe

these variables are replaced with real values and I can see the picture.

thats exactly what variables are for. there just places to store data. wouldnt be much use if they just printed there names to the screen.