How to get a piece of text from PHP file - php

Question

From wp-config.php file I need to get DB name, username, password values without including the wp-config file and assign them to three separate variable for further use.
define('DB_NAME', 'somedb');
define('DB_USER', 'someuser');
define('DB_PASSWORD', 'somepass');
my script will be in the same folder. No I don't want to use any WordPress functions.

Answer 1

If you really don't want to include the file, as mentioned in the comments already,
we can read the file contents into an array with file().
The iterate over each line and apply some cleanup, until we get to a format we can work with:
<?php
$config = file('wp-config.php');
$dbLines = [];
foreach($config as $line){
if (stristr($line,"define('DB_")!==FALSE){
$dbLines[] = $line;
}
}
array_walk($dbLines, 'cleanup');
// apply the cleanup() function to all members of the array, basically to each line
function cleanup(&$value){
// replace the leading 'define(' and trailing closing bracket
$value = str_replace(
array("define(",");"),'',$value
);
$value = preg_replace('#\s+//(.*)#','',$value); // remove the comments
}
// at this point we have a csv structure with a single quote as the delimiter
// comma+space as a separator
$dbConfig = [];
foreach ($dbLines as $dbline){
// read the line into separate variables and build an array
list($key,$value) = (str_getcsv($dbline,', ',"'"));
$dbConfig[$key] = $value;
}
print_r($dbConfig);
This will output
Array
(
[DB_NAME] => putyourdbnamehere
[DB_USER] => usernamehere
[DB_PASSWORD] => yourpasswordhere
[DB_HOST] => localhost
[DB_CHARSET] => utf8
[DB_COLLATE] =>
)
If you want to access a single element from the array, just
print $dbConfig['DB_HOST'];