Create copy of php.ini without xdebug. When using phan, I don't want to have xdebug in the php.ini but I don't want to maintain a separate config file for phan. So I use php to create a custom php.ini without xdebug, then call php with the custom config to run phan.

create-php-ini.php

<?php
declare(strict_types=1);

/**
 * This reads the php.ini the current CLI process is using and creates a copy
 * so we can kick out xdebug and use the created config for phan without having to remove xdebug globally.
 */

function cleanIniFile(string $content): string {
    $noComments = preg_replace("/^;.*\n/m", '', $content);
    return preg_replace("/\n+/m", "\n", $noComments);
}

// Fetch ini-file info from current phpinfo
ob_start();
phpinfo(INFO_GENERAL);
$general = ob_get_clean();

$matches = [];
if (preg_match('/^Loaded Configuration File => (.*)$/m', $general, $matches)) {
    $configFilename = $matches[1];
} else {
    throw new RuntimeException('Config file name not detected');
}

// Get basic php.ini without comments
$iniContent = cleanIniFile(file_get_contents($configFilename));

// Add all extra loaded ini files into the custom php.ini
if (preg_match("/Additional \.ini files parsed => (.*?)\n\n/s", $general, $matches)) {
    $extraInis = explode(',', $matches[1]);
    foreach ($extraInis as $extra) {
        if (strpos($extra, 'xdebug') !== false) {
            continue;
        }
        $filename = trim($extra);
        $content = cleanIniFile(file_get_contents($filename));
        $iniContent .= "\n" . trim($content);
    }
}

file_put_contents(__DIR__ . '/phan-php.ini', $iniContent);

Usage: php create-php-ini.php && php -n -c phan-php.ini vendor/bin/phan