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<?php
namespace Drupal\Core\Utility;
/**
* Provides an object for dynamically identifying the minimum supported PHP.
*/
final class PhpRequirements {
/**
* The minimum PHP version requirement for the installed Drupal version.
*
* This property is maintained to make the class testable.
*
* @var string
*
* @see version_compare()
*/
private static $drupalMinimumPhp = \Drupal::MINIMUM_PHP;
/**
* The expected PHP version end-of-life dates, keyed by PHP minor version.
*
* The array keys are in 'major.minor' format, and the date values are in ISO
* 8601 format.
*
* @var string[]
* An array of end-of-life dates in ISO 8601 format, keyed by the PHP minor
* version in 'major.minor' format. The list must be sorted in an ascending
* order by the date. Multiple versions EOL on the same day must be sorted
* by the PHP version.
*/
private static $phpEolDates = [
'8.3' => '2027-12-31',
];
/**
* This class should not be instantiated.
*/
private function __construct() {
}
/**
* Dynamically identifies the minimum supported PHP version based on the date.
*
* Drupal automatically increases the minimum supported PHP version from
* \Drupal::MINIMUM_PHP to a newer version after PHP's documented end-of-life
* date for the previous version.
*
* Below this version:
* - New sites can be installed (to allow update deployment workflows that
* reinstall sites from configuration), but a warning is displayed in the
* installer that the PHP version is too old (except within tests).
* - Updates from previous Drupal versions can be run, but users are warned
* that Drupal no longer supports that PHP version.
* - An error is shown in the status report that the PHP version is too old.
*
* @param \DateTime|null $date
* The DateTime to check. Defaults to the current datetime (now) if NULL.
*
* @return string
* The minimum supported PHP version on the date in a PHP-standardized
* number format supported by version_compare(). For example, '8.0.2' or
* '8.1'. This will be the lowest PHP version above the minimum PHP version
* supported by Drupal that is still supported, or the highest known PHP
* version if no known versions are still supported.
*
* @see version_compare()
*/
public static function getMinimumSupportedPhp(?\DateTime $date = NULL): string {
// By default, use the current date (right now).
$date = $date ?? new \DateTime('now');
// In case no data are available or all known PHP versions in this class
// are already end-of-life, default to the version that had the most recent
// end-of-life (the key of the last element in the sorted array).
// The string cast ensures the value is a string, even if the PHP EOL date
// array is empty. As of PHP 8.1, version_compare() no longer accepts NULL
// as a parameter; empty string must be used instead.
$lowest_supported_version = (string) array_key_last(static::$phpEolDates);
// Next, look at versions that are end-of-life after the current date.
// Find the lowest PHP version that is still supported.
foreach (static::$phpEolDates as $version => $eol_date) {
$eol_datetime = new \DateTime($eol_date);
if ($eol_datetime > $date) {
// If $version is less than the previously discovered lowest supported
// version, use $version as the lowest supported version instead.
if (version_compare($version, $lowest_supported_version) < 0) {
$lowest_supported_version = $version;
}
}
}
// If PHP versions older than the Drupal minimum PHP version are still
// supported, return Drupal minimum PHP version instead.
if (version_compare($lowest_supported_version, static::$drupalMinimumPhp) < 0) {
return static::$drupalMinimumPhp;
}
// Otherwise, return the lowest supported PHP version.
return $lowest_supported_version;
}
}
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