PHP流程控制的替代语法
PHP流程控制的替代语法(The alternative syntax of the PHP process control)早在PHP 4.时代就已存在,只是不见有太多的使用罢了。 ## 那么,PHP中哪些语法有替代语法?
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## 针对流程控制语句,包括if,while,for,foreach和switch这几个语句有替代语法。
替代语法的基本形式 ## 左花括号({)换成冒号(:),把右花括号(})分别换成 endif;,endwhile;,endfor;,endforeach; 以及 endswitch; ##
应用 典型情况下,在纯PHP代码中一般不使用上述替代语法形式,以便与其他流行语句尽量保持一致的可读性原因所致吧。但是,在网页语言中,当你使用PHP开发时,就会经常见到流程语句的替代语法形式了。 也就是说,这些语法能发挥的地方是在PHP和HTML混合页面的代码里面。好处如下:
1.使HTML和PHP混合页面代码更加干净整齐。 有代码洁癖的朋友最惧怕的就是乱七八糟的混合代码,有了这些没有花括号的替代语法,各位爱干净的朋友开心到尿震。
2.流程控制逻辑更清晰,代码更容易阅读 要改别人的PHP和HTML混合代码,打开发现,我擦!太TMD垃圾了!如果用替代语法,我想再垃圾的程序开发人员也不至于写的太乱吧。
3.一些从ASP等其他类basic语言家族转来的朋友,会更容易使用PHP。 ## 一个典型的例子是在WordPress网站代码中,你会经常见到。举例如下:
class="no-js">
>
上述代码来自于著名的Twenty_Fifteen主题中的header.php文件定义。
新闻名称:PHP流程控制的替代语法
标题路径:
http://www.tsicrk.com/article/geiohd.html
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请求信息 : 2026-05-18 07:26:30 HTTP/1.1 GET : /article/geiohd.html 运行时间 : 2.2245s ( Load:0.0064s Init:1.5728s Exec:0.6362s Template:0.0091s ) 吞吐率 : 0.45req/s 内存开销 : 2,225.27 kb 查询信息 : 12 queries 5 writes 文件加载 : 36 缓存信息 : 0 gets 0 writes 配置加载 : 130 会话信息 : SESSION_ID=5jc0il472luhvno3n6nd887fs5
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[ app_init ] --START-- Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ] [ app_init ] --END-- [ RunTime:0.000027s ] [ app_begin ] --START-- Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000273s ] [ app_begin ] --END-- [ RunTime:0.000291s ] [ view_parse ] --START-- [ template_filter ] --START-- Run Behavior\ContentReplaceBehavior [ RunTime:0.000060s ] [ template_filter ] --END-- [ RunTime:0.000080s ] Run Behavior\ParseTemplateBehavior [ RunTime:0.006217s ] [ view_parse ] --END-- [ RunTime:0.006245s ] [ view_filter ] --START-- Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000190s ] [ view_filter ] --END-- [ RunTime:0.000209s ] [ app_end ] --START--
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[ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
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