@francis 我访问页面是啥都没有，连报错都没有，YII有没有把错误写入日志文件呢？哪个地方可以看日志啥的？

可否举例？ YII有文件名规则文档么？我在开发手册没有看到，YII新手

可否举例？

Check conclusion:

PHP version: OK

Reflection extension: OK

PCRE extension: OK

SPL extension: OK

MBString extension: OK

OpenSSL extension: OK

Intl extension: WARNING!!!
Required 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.

ICU version: WARNING!!!
Required 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 INTL_ICU_VERSION.

Fileinfo extension: WARNING!!!
Required by: File Information
Memo: Required for files upload to detect correct file mime-types.

DOM extension: OK

PDO extension: OK

PDO SQLite extension: OK

PDO MySQL extension: OK

PDO PostgreSQL extension: WARNING!!!
Required by: All DB-related classes
Memo: Required for PostgreSQL database.

Memcache extension: OK

APC extension: WARNING!!!
Required by: ApcCache

GD PHP extension with FreeType support: OK

ImageMagick PHP extension with PNG support: WARNING!!!
Required by: Captcha
Memo: Either GD PHP extension with FreeType support or ImageMagick PHP extension with PNG support is required for image CAPTCHA.

Expose PHP: WARNING!!!
Required by: Security reasons
Memo: "expose_php" should be disabled at php.ini

PHP allow url include: OK

PHP mail SMTP: OK

Errors: 0 Warnings: 7 Total checks: 21

这样的warning会导致不可运行么？