composer require piwik/ini

There is no native support for modifying the configuration. You can implement it yourself or use someone else’s wheel

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<?php

require 'vendor/autoload.php';

use WriteiniFile\WriteiniFile;

$data = [
    'fruit' => ['orange' => '100g', 'fraise' => '10g'],
    'legume' => ['haricot' => '20g', 'oignon' => '100g'],
    'jus' => ['orange' => '1L', 'pomme' => '1,5L', 'pamplemousse' => '0,5L'],
];

// demo create ini file
$a = new WriteiniFile('file.ini');
$a->create($data);
$a->add([
    'music' => ['rap' => true, 'rock' => false]
]);
$a->rm([
    'jus' => ['pomme' => '1,5L']
]);
$a->update([
    'fruit' => ['orange' => '200g'] // 100g to 200g
]);
$a->write();

echo '<pre>'.file_get_contents('file.ini').'</pre>';

/* output file.ini
[fruit]
orange = "200g"
fraise = "10g"

[legume]
haricot = "20g"
oignon = "100g"

[jus]
orange = "1L"
pamplemousse = "0,5L"

[music]
rap = 1
rock = 0
*/

$b = new WriteiniFile('file.ini');
$b->erase();
$b->write();