'PHP version', 'mandatory' => true, 'condition' => version_compare(PHP_VERSION, '5.4.0', '>='), 'by' => 'Yii Framework', 'memo' => 'PHP 5.4.0 or higher is required.', ), array( 'name' => 'Reflection extension', 'mandatory' => true, 'condition' => class_exists('Reflection', false), 'by' => 'Yii Framework', ), array( 'name' => 'PCRE extension', 'mandatory' => true, 'condition' => extension_loaded('pcre'), 'by' => 'Yii Framework', ), array( 'name' => 'SPL extension', 'mandatory' => true, 'condition' => extension_loaded('SPL'), 'by' => 'Yii Framework', ), array( 'name' => 'Ctype extension', 'mandatory' => true, 'condition' => extension_loaded('ctype'), 'by' => 'Yii Framework' ), array( 'name' => 'MBString extension', 'mandatory' => true, 'condition' => extension_loaded('mbstring'), 'by' => 'Multibyte string processing', 'memo' => 'Required for multibyte encoding string processing.' ), array( 'name' => 'OpenSSL extension', 'mandatory' => false, 'condition' => extension_loaded('openssl'), 'by' => 'Security Component', 'memo' => 'Required by encrypt and decrypt methods.' ), array( 'name' => 'Intl extension', 'mandatory' => false, 'condition' => $this->checkPhpExtensionVersion('intl', '1.0.2', '>='), 'by' => 'Internationalization support', 'memo' => 'PHP Intl extension 1.0.2 or higher is required when you want to use advanced parameters formatting in Yii::t(), non-latin languages with Inflector::slug(), IDN-feature of EmailValidator or UrlValidator or the yii\i18n\Formatter class.' ), array( 'name' => 'ICU version', 'mandatory' => false, 'condition' => defined('INTL_ICU_VERSION') && version_compare(INTL_ICU_VERSION, '49', '>='), 'by' => 'Internationalization support', 'memo' => 'ICU 49.0 or higher is required when you want to use # placeholder in plural rules (for example, plural in Formatter::asRelativeTime()) in the yii\i18n\Formatter class. Your current ICU version is ' . (defined('INTL_ICU_VERSION') ? INTL_ICU_VERSION : '(ICU is missing)') . '.' ), array( 'name' => 'ICU Data version', 'mandatory' => false, 'condition' => defined('INTL_ICU_DATA_VERSION') && version_compare(INTL_ICU_DATA_VERSION, '49.1', '>='), 'by' => 'Internationalization support', 'memo' => 'ICU Data 49.1 or higher is required when you want to use # placeholder in plural rules (for example, plural in Formatter::asRelativeTime()) in the yii\i18n\Formatter class. Your current ICU Data version is ' . (defined('INTL_ICU_DATA_VERSION') ? INTL_ICU_DATA_VERSION : '(ICU Data is missing)') . '.' ), array( 'name' => 'Fileinfo extension', 'mandatory' => false, 'condition' => extension_loaded('fileinfo'), 'by' => 'File Information', 'memo' => 'Required for files upload to detect correct file mime-types.' ), array( 'name' => 'DOM extension', 'mandatory' => false, 'condition' => extension_loaded('dom'), 'by' => 'Document Object Model', 'memo' => 'Required for REST API to send XML responses via yii\web\XmlResponseFormatter.' ), array( 'name' => 'IPv6 support', 'mandatory' => false, 'condition' => strlen(@inet_pton('2001:db8::1')) === 16, 'by' => 'IPv6 expansion in IpValidator', 'memo' => 'When IpValidator::expandIPv6 property is set to true, PHP must support IPv6 protocol stack. Currently PHP constant AF_INET6 is not defined and IPv6 is probably unsupported.' ) );