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assing a value to DEfine

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Join Date: Sep 2007

Posts: 16

Reputation: pedramphp is an unknown quantity at this point

Solved Threads: 0

pedramphp

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Newbie Poster

assing a value to DEfine

Nov 19th, 2008

Dear folk ,

consider I define a constant value

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
<?php
  /*--------values.inc.php ------------*/
  define("Data","MyValue")
?>
<?php
  /*--------values.inc.php ------------*/
  define("Data","MyValue")
?>

so right now I want to change the Value of Data from another page and I wold like that to be saved on Values.inc.php file , you know I'm thinking some kind of data Store ,instead of using data bases.I have seen smarty template ENgine has done this before , could some on help me !!
let me clear , next time when I open the values.. file I would like to see

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
<?php
  /*--------values.inc.php ------------*/
  define("Data","AnotherValue")
?>
<?php
  /*--------values.inc.php ------------*/
  define("Data","AnotherValue")
?>

THanks

Last edited by peter_budo; Nov 20th, 2008 at 1:10 pm. Reason: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks) and [icode] (inline code) tags.

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Join Date: Jul 2006

Posts: 748

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pritaeas

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Master Poster

Re: assing a value to DEfine

Nov 20th, 2008

You can change the file itself, if you have write permission on it. Open the file and use a regex to replace the old value with the new.

"If it is NOT source, it is NOT software."
-- NASA

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Join Date: Sep 2007

Posts: 16

Reputation: pedramphp is an unknown quantity at this point

Solved Threads: 0

pedramphp

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Newbie Poster

Re: assing a value to DEfine

Nov 20th, 2008

could you tell me how this code look like !!
I'm not familiar with Regular Expression
thanks

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Join Date: Jun 2007

Posts: 1,225

Reputation: kkeith29 has a spectacular aura about

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kkeith29

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Nearly a Posting Virtuoso

Re: assing a value to DEfine

Nov 20th, 2008

you could get the file contents and then use str_replace.

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
$file = 'values.inc.php';
$fh = fopen( $file,'r' );
$data = fread( $file,filesize( $file ) );
fclose( $fh );
//or you can use file_get_contents()
 
$str = 'define("data","myValue");';
$with = 'define("data","newValue");';
 
$data = str_replace( $str,$with,$data );
 
$fh = fopen( $file,'w' );
fwrite( $fh,$data );
fclose( $fh );
$file = 'values.inc.php';
$fh = fopen( $file,'r' );
$data = fread( $file,filesize( $file ) );
fclose( $fh );
//or you can use file_get_contents()

$str = 'define("data","myValue");';
$with = 'define("data","newValue");';

$data = str_replace( $str,$with,$data );

$fh = fopen( $file,'w' );
fwrite( $fh,$data );
fclose( $fh );

Last edited by kkeith29; Nov 20th, 2008 at 6:05 pm.

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Join Date: Sep 2005

Posts: 1,050

Reputation: digital-ether is just really nice

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digital-ether digital-ether is offline

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Veteran Poster

Re: assing a value to DEfine

Nov 21st, 2008

•

Originally Posted by pedramphp

Dear folk ,

consider I define a constant value
Help with Code Tags

php Syntax (Toggle Plain Text)
<?php
  /*--------values.inc.php ------------*/
  define("Data","MyValue")
?>
<?php /*--------values.inc.php ------------*/ define("Data","MyValue") ?>
so right now I want to change the Value of Data from another page and I wold like that to be saved on Values.inc.php file , you know I'm thinking some kind of data Store ,instead of using data bases.I have seen smarty template ENgine has done this before , could some on help me !!
let me clear , next time when I open the values.. file I would like to see
Help with Code Tags

php Syntax (Toggle Plain Text)
<?php
  /*--------values.inc.php ------------*/
  define("Data","AnotherValue")
?>
<?php /*--------values.inc.php ------------*/ define("Data","AnotherValue") ?>
THanks

I thought I'd add:

What you mention is common in PHP configuration files, or language files.

Usually, you know the names of the constants that you have saved in the file in advance. But if you don't, you could use an array, as it allows you to discover all the variables saved in it.

eg: file config.php

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<?php
 
$config = array();
 
$config['name1'] = 'value1';
$config['name2'] = 'value2';
 
?>
<?php

$config = array();

$config['name1'] = 'value1';
$config['name2'] = 'value2';

?>

Then when you want to add or remove something from your storage file, you can just include() the file, and get the array, modify it and write it back to file.

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<?php
 
require_once('config.php');
 
$config['name1'] = 'newvalue1';
 
$contents = "
 
\$config = array();
\$config[name1] = '{$config[name1]}';
\$config[name2] = '{$config[name2]}';
 
";
 
file_put_contents('config.php', $contents);
 
?>
<?php

require_once('config.php');

$config['name1'] = 'newvalue1';

$contents = "

\$config = array();
\$config[name1] = '{$config[name1]}';
\$config[name2] = '{$config[name2]}';

";

file_put_contents('config.php', $contents);

?>

Note the forward slash before the $ signs lets PHP know that the $ sign is a literal instead of being the start of a variable.

It you don't know the names of the indexes in the array, then you can iterate through the array in a loop.
With constants, its harder to do this.

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<?php
 
require_once('config.php');
 
$config['name1'] = 'newvalue1';
 
$contents = "\$config = array();";
 
foreach($config as $name=>$value) {
  $contents .= "\$config[$name] = '$value';";
}
 
file_put_contents('config.php', $contents);
 
?>
<?php

require_once('config.php');

$config['name1'] = 'newvalue1';

$contents = "\$config = array();";

foreach($config as $name=>$value) {
  $contents .= "\$config[$name] = '$value';";
}

file_put_contents('config.php', $contents);

?>

Another way of doing it is to create a Class, and define properties of that class. Example:

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
class Config {
 
  var $name1 = 'value1';
  var $name2 = 'value2';
 
}
class Config {

  var $name1 = 'value1';
  var $name2 = 'value2';

}

Like an array, the properties of the class instance can be iterated over. Some consider this better because a class is automatically global while an array isn't.

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