How to Know Which 'PHP.Ini' File Is Used

How can I know which 'php.ini' file is used?

You can use php_ini_loaded_file().

Taken from php.net:

$inipath = php_ini_loaded_file();
if ($inipath) {
    echo 'Loaded php.ini: ' . $inipath;
} else {
    echo 'A php.ini file is not loaded';
}

You may also want to check php_ini_scanned_files().

Also, you should note that if you run a PHP script from CLI, it's possible that a different php.ini file will be used than if a server (e.g., nginx or Apache) runs it.

Other options:

• php -i|grep 'php.ini'
• create info.php that contains <?php phpinfo(); in the webroot, and run it in your browser

How can I find the php.ini file used by the command line?

Just run php --ini and look for Loaded Configuration File in the output for the location of php.ini used by your CLI.

Not able to get which php.ini is used

You wrote:

phpinfo() gives path as c:\windows but there is no php.ini

This means your .dll expects the configuration file in c:\windows.
Your tutorial mistakenly advises to create a configuration file in c:\php\php.ini. Move it to c:\windows, edit it to your liking, and it should work fine.

I would advise a beginner who seeks to learn PHP/Apache to use ready-to-use packages at first, such as WAMP Server. Manual installations require deeper understanding of PHP (and Apache to some extent).

Who reads the 'php.ini' file and how many php.ini files can possibly be exist there? What's the role of every such 'php.ini' file?

1. The PHP compiler/parser.
2. Because PHP does not persist for command line invocations, so it is read at run-time.
3. Every time you call a PHP script, either CGI or CLI.
4. More than one, typically 2. One for the web server and one for CLI/CGI.

Getting value of web php.ini file from console script

You can use echo php_ini_loaded_file(); from the web to find the name of the web/apache2 ini file. In my case, it is /usr/local/zend/etc/php.ini.

Then, in your CLI application, you can parse the ini file into an array which you can use to retrieve the data you need.

<?php
$config = parse_ini_file('/usr/local/zend/etc/php.ini');

// Ouput of `var_dump($config);`
array (size=118)
  'engine' => string '1' (length=1)
  'short_open_tag' => string '1' (length=1)
  'precision' => string '14' (length=2)
  'output_buffering' => string '4096' (length=4)
  'zlib.output_compression' => string '' (length=0)
  'implicit_flush' => string '' (length=0)
  'unserialize_callback_func' => string '' (length=0)
  'serialize_precision' => string '-1' (length=2)
  'disable_functions' => string '' (length=0)
  'disable_classes' => string '' (length=0)
  'realpath_cache_size' => string '256k' (length=4)
  'zend.enable_gc' => string '1' (length=1)
  'expose_php' => string '1' (length=1)
  'max_execution_time' => string '500' (length=3)
  'max_input_time' => string '60' (length=2)
  'memory_limit' => string '256M' (length=4)
  'error_reporting' => string '32767' (length=5)
  'display_errors' => string '1' (length=1)
  'display_startup_errors' => string '1' (length=1)
  ...

echo $config['max_execution_time']; // 500

where php.ini of is located in laravel applications?

You can use phpinfo() function to check where the php.ini file is located at:

<?php

phpinfo();

Or simply run php artisan tinker in the terminal where the laravel project is and then run phpinfo() in same terminal.

Then, look for Configuration File (php.ini) Path in the output of phpinfo().

Where can I find php.ini?

The best way to find this is:

Create a PHP (.php) file and add the following code:

<?php phpinfo(); ?>

and open it in a browser. It will show the file which is actually being read!

Updates by the OP:

1. The previously accepted answer is likely to be faster and more convenient for you, but it is not always correct. See comments on that answer.
2. Please also note the more convenient alternative <?php echo php_ini_loaded_file(); ?> mentioned in this answer.

I can not find my php.ini file

execute this command

locate php.ini

This will give you a list of all files with names where 'php.ini' is a part of it.

E.g.

/etc/php.ini
/etc/php.ini.rpmnew
/home/myuser/mywebsite.com/demo/local_php.ini

...

Which PHP Ini file does my WAMP webpage uses?

you can find it in phpinfo() output

create file info.php

<?php
phpinfo();

and call it from web server

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