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Nov 19th, 2008

assing a value to DEfine

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Dear folk ,

consider I define a constant value

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

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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pedramphp

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Nov 20th, 2008

Re: assing a value to DEfine

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.

pritaeas

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Nov 20th, 2008

Re: assing a value to DEfine

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

pedramphp

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Nov 20th, 2008

Re: assing a value to DEfine

you could get the file contents and then use str_replace.

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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Nov 21st, 2008

Re: assing a value to DEfine

Click to Expand / Collapse Quote originally posted by pedramphp ...

Dear folk ,

consider I define a constant value
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
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

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.

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.

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:

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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