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php设计模式之单例模式

少林码僧发布时间：2017-06-04 19:11:56 ，浏览量：4

单例模式也称单态，是23种设计模式中最简单的一种，从他的名字就可以知道他的核心思想，单例模式就是系统中只有一个这样的对象，对象只有一个，在Java或者C#中，单例模式一般有两种，分别是懒汉式、饿汉式，但是在PHP中常用的就是懒汉式，由于PHP是单线程的，懒汉式也不存在双重验证。

    懒汉式具体代码：


    
        
            
                
                
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	    基本
        文件
        流程
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	请求信息 : 2025-08-19 12:24:39 HTTP/2.0 GET : /home/article/detail/id/401710.html
运行时间 : 0.0515s ( Load:0.0134s Init:0.0017s Exec:0.0232s Template:0.0132s )
吞吐率 : 19.42req/s
内存开销 : 1,923.99 kb
查询信息 : 18 queries 0 writes 
文件加载 : 36
缓存信息 : 5 gets 0 writes 
配置加载 : 132
会话信息 : SESSION_ID=movur507ci095qgmgi61615k65
    
    
        
    
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	[ app_init ] --START--
Run Behavior\BuildLiteBehavior [ RunTime:0.000011s ]
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[ app_begin ] --START--
Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000510s ]
[ app_begin ] --END-- [ RunTime:0.000557s ]
[ view_parse ] --START--
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Run Behavior\ContentReplaceBehavior [ RunTime:0.000070s ]
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Run Behavior\ParseTemplateBehavior [ RunTime:0.010471s ]
[ view_parse ] --END-- [ RunTime:0.010509s ]
[ view_filter ] --START--
Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000229s ]
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[ app_end ] --START--
    
    
        
    
	[2] session_save_path(): open_basedir restriction in effect. File(/var/lib/php/session) is not within the allowed path(s): (/www/wwwroot/www.chaojiit.com/:/tmp/) /www/wwwroot/www.chaojiit.com/ThinkPHP/Common/functions.php 第 1239 行.
[8192] Array and string offset access syntax with curly braces is deprecated /www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 37 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 97 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 97 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Undefined variable: pinglun_list /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 107 行.
    
    
        
    
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SHOW COLUMNS FROM `article_cate` [ RunTime:0.0004s ]
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0.0515s