最近项目中要为一个rest服务写客户端,其中的签名校验需要在HTTP Header中生成一个RFC 1123格式的Date。
这个问题比较好解决,简单翻阅了PHP文档,使用gmstrftime这个函数就能解决。
string gmstrftime ( string $format [, int $timestamp = time() ] )
调用的代码如下:
echo gmstrftime("%a, %d %b %Y %T %Z",time());
//输出:Tue, 01 Apr 2014 16:16:07 GMT
调试过程中发现,在另外一台电脑上,输出并不像预期中的结果,然后产生了中文:
二, 01 4 2014 16:20:02 GMT
继续翻阅文档,发现文档的注释中有说明,这个函数的结果受setlocale结果的影响,既收当前系统默认的语言的影响。使用下面的命令可以查看当前系统已安装的语言:
locale -a
那么根据刚刚分析的结果,将setlocale强制指定为英语就没问题了,代码如下:
setlocale(LC_TIME, 'en_US');
echo gmstrftime("%a, %d %b %Y %T %Z",time());
至此文章应该已经结束了,不过可惜的是测试用的Ubuntu机器上,因为是Live CD版,恰好没有en_US这个语言,但是有一个en_US.UTF-8。这个时候心理打鼓,这种做法似乎不太安全,我没办法确定运行代码的客户机上,到底有en_US还是有en_US.UTF-8。还好看到文档里的一段comments,可以用gmdate来代替,该函数不受setlocale结果的影响:
gmdate('D, d M Y H:i:s') . ' GMT';
Case closed~需求虽小,要写好并不容易,以后还要多加努力。

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