2 Questions

Corey

May 29 2005, 05:39 PM

i have 2 questions about PHP...please don't answer like "use google"...or something...because i tried and didn't find anything..so

1.

example..i have a varible called $var and it contains 50 characters..so how can i write only part of them (1,2,3,20)?

2.

example like the one before... i have a varible called $var with 50 characters..how can i write the first /second /third.. charachter from the $var

tnx;)

OpaQue

May 29 2005, 06:05 PM

The substr function of PHP will allow you to get part of the variable.

The access particular characters, you will have to use a Curly braces.

Suppose, you have $var="tommy";

So, $var{1} will give you "o" as output. This is a rough idea since I haven't used this function for a long time.

However, you can search for substr directly now :-) instead of searching everything.

Tyssen

May 30 2005, 12:08 AM

You can also specify the number of characters and count from the begining or end of the string. PHP.net has some good examples of how that works.
But I think you can only use substr if the characters run in succession, e.g. 1-3, 4-8 etc. If you want to extract characters at random e.g. 1,3,7,9,12, you might have to create an array of different characters and work with that instead.

OpaQue

May 30 2005, 12:16 AM

An Array of diffrent characters is not needed. Strings are stored as arrays internally. All you have to do is access the diffrent characters using the following syntax,

$variable_name{index};

index will be the character postion from 0. Try it out :-).

Mike

May 30 2005, 12:43 AM

Like OpaQue said, you would use the substr() function. The only thing that I am not sure about in what OpaQue posted, is the $variable{n}. Unless that is another way to use the substr function, quickly of course. Basically the substr() function works like substr($variable, nlettertostartat);

CODE

<?php

$string = 'Testing';
$substr = substr($string,3);

echo $substr; // Result: 'ting'

?>

Actually, if you want to just get a certain character/characters, do what OpaQue said. $variable{n characetr [1,2,3,4,etc]}.

Tyssen

May 30 2005, 01:36 AM

Sorry, I was thinking about a single function to extract a set of characters rather than a series concatenated together.

Corey

May 30 2005, 08:01 AM

tnx everyone ..

btw..

do you know some simple script that can write the content of some folder..

example

- Downloads
-1.rar
-3.rar
-5.jpg

...

Tyssen

May 30 2005, 12:03 PM

Here's a stripped down version of one I use on a site I'm developing for a friend:

CODE

if ($handle = opendir($PathtoYourDirectory)) {
while (false !== ($file =
readdir($handle))) {
if ($file != "." && $file != "..") {
$file_array[] = $file;
}
}
}

closedir($handle);
$result=array_unique($file_array);
natcasesort($result);
reset($file_array);
foreach($result as $file){
echo $file."<br />";
}
unset($file_array);

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