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    php单例模式顾名思义,就是只有一个实例。作为对象的创建模式,单例模式确保某一个类只有一个实例,而且自行实例化并向整个系统提供这个实例,这个类我们称为单例类
    PHP7距正式发布以及有挺长时间了,刚出道就号称比旧版本快了几倍,各种开源框架或系统运行在PHP7上速度效率提高了几倍
    PHP和JS在嵌入页面的方式,输出语法,数据类型,以及定义变量,字符串拼接,类型转换上都存在着区别
    面向过程和面向对象区别有:面向过程效率比面向对象高,面向对象的编程复杂度更高,但是后期面向对象比面向过程好维护
    从空类的测试结果来看,new的性能更高。从带构造方法、属性的类测试结果来看,clone的性能要比new带上构造参数的性能高不少
    数据类型定义变量可以存储的数据类型。PHP允许八种不同类型的数据类型,前五个称为简单数据类型,后三个是复合数据类型
    二分查找也称折半查找(Binary Search),它是一种效率较高的查找方法。但是,折半查找要求线性表必须采用顺序存储结构,而且表中元素按关键字有序排列
    trim()函数是PHP中的一个内置函数,可以用于删除字符串左右两边的空格以及预定义字符
    "3w" 还有商标可以注册,为防止被他人占用,建议立即注册进行保护!注册商标>>
    注册人
    Registrant Name
    chang an xiao
    注册人联系邮箱
    Registrant E-mail
    Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.  委托西部数码代购
    注册商
    Sponsoring Registrar
    Chengdu West Dimension Digital Technology Co., Ltd. 转入西部数码管理
    注册日期
    Registration Date
    2023-03-30 09:51:49
    到期日期
    Expiration Date
    2024-03-30 09:51:49
    域名状态
    Domain Status
    redemptionPeriod
    DNS服务器
    Name Server
    ns1-domain-expired.myhostadmin.net
    ns2-domain-expired.myhostadmin.net
    Domain Name: 3w.fan
    Registry Domain ID: acccadf70ca34b3faf544ba5af1a1513-DONUTS
    Registrar WHOIS Server: whois.west.cn
    Registrar URL: http://www.west.cn
    Updated Date: 2024-04-30T01:32:46Z
    Creation Date: 2023-03-30T01:51:49Z
    Registry Expiry Date: 2024-03-30T01:51:49Z
    Registrar: Chengdu West Dimension Digital Technology Co., Ltd.
    Registrar IANA ID: 1556
    Registrar Abuse Contact Email: abuse@west.cn
    Registrar Abuse Contact Phone: +86.2862778877
    Domain Status: redemptionPeriod https://icann.org/epp#redemptionPeriod
    Registry Registrant ID: REDACTED FOR PRIVACY
    Registrant Name: REDACTED FOR PRIVACY
    Registrant Organization: chang an xiao
    Registrant Street: REDACTED FOR PRIVACY
    Registrant City: REDACTED FOR PRIVACY
    Registrant State/Province: Hu Bei
    Registrant Postal Code: REDACTED FOR PRIVACY
    Registrant Country: CN
    Registrant Phone: REDACTED FOR PRIVACY
    Registrant Phone Ext: REDACTED FOR PRIVACY
    Registrant Fax: REDACTED FOR PRIVACY
    Registrant Fax Ext: REDACTED FOR PRIVACY
    Registrant Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
    Registry Admin ID: REDACTED FOR PRIVACY
    Admin Name: REDACTED FOR PRIVACY
    Admin Organization: REDACTED FOR PRIVACY
    Admin Street: REDACTED FOR PRIVACY
    Admin City: REDACTED FOR PRIVACY
    Admin State/Province: REDACTED FOR PRIVACY
    Admin Postal Code: REDACTED FOR PRIVACY
    Admin Country: REDACTED FOR PRIVACY
    Admin Phone: REDACTED FOR PRIVACY
    Admin Phone Ext: REDACTED FOR PRIVACY
    Admin Fax: REDACTED FOR PRIVACY
    Admin Fax Ext: REDACTED FOR PRIVACY
    Admin Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
    Registry Tech ID: REDACTED FOR PRIVACY
    Tech Name: REDACTED FOR PRIVACY
    Tech Organization: REDACTED FOR PRIVACY
    Tech Street: REDACTED FOR PRIVACY
    Tech City: REDACTED FOR PRIVACY
    Tech State/Province: REDACTED FOR PRIVACY
    Tech Postal Code: REDACTED FOR PRIVACY
    Tech Country: REDACTED FOR PRIVACY
    Tech Phone: REDACTED FOR PRIVACY
    Tech Phone Ext: REDACTED FOR PRIVACY
    Tech Fax: REDACTED FOR PRIVACY
    Tech Fax Ext: REDACTED FOR PRIVACY
    Tech Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
    Name Server: ns1-domain-expired.myhostadmin.net
    Name Server: ns2-domain-expired.myhostadmin.net
    DNSSEC: unsigned
    URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
    >>> Last update of WHOIS database: 2024-05-18T07:41:27Z <<<

    For more information on Whois status codes, please visit https://icann.org/epp

    Terms of Use: Access to WHOIS information is provided to assist persons in determining the contents of a domain name registration record in the registry database. The data in this record is provided by Identity Digital or the Registry Operator for informational purposes only, and accuracy is not guaranteed. This service is intended only for query-based access. You agree that you will use this data only for lawful purposes and that, under no circumstances will you use this data to (a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the data recipient's own existing customers; or (b) enable high volume, automated, electronic processes that send queries or data to the systems of Registry Operator, a Registrar, or Identity Digital except as reasonably necessary to register domain names or modify existing registrations. When using the Whois service, please consider the following: The Whois service is not a replacement for standard EPP commands to the SRS service. Whois is not considered authoritative for registered domain objects. The Whois service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the Whois services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of Whois service access. Abuse of the Whois system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the Whois records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data provided by Identity Digital can be requested by submitting a request via the form found at https://www.identity.digital/about/policies/whois-layered-access/. The Registrar of Record identified in this output may have an RDDS service that can be queried for additional information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Identity Digital Inc. and Registry Operator reserve the right to modify these terms at any time. By submitting this query, you agree to abide by this policy.
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