


In a recent project, I need to write a client for a REST service. The signature verification needs to generate a Date in RFC 1123 format in the HTTP Header.
This problem is relatively easy to solve. Simply read the PHP documentation and use the gmstrftime function to solve it.
string gmstrftime ( string $format [, int $timestamp = time() ] )
The calling code is as follows:
echo gmstrftime("%a, % d %b %Y %T %Z",time());
//Output: Tue, 01 Apr 2014 16:16:07 GMT
During the debugging process, it was found that on another computer On, the output is not as expected, and then produces Chinese:
2, 01 4 2014 16:20:02 GMT
Continuing to read the document, I found that there is a description in the comments of the document that the result of this function is affected by the setlocale result, which is affected by the current system default language. Use the following command to view the languages installed on the current system:
locale -a
Then based on the results just analyzed, it will be no problem to force setlocale to English. The code is as follows:
setlocale(LC_TIME, 'en_US');
echo gmstrftime("%a, %d %b %Y %T %Z",time());
That’s it The article should be over, but unfortunately, on the Ubuntu machine used for testing, because it is the Live CD version, there happens to be no en_US language, but there is en_US.UTF-8. At this time, I thought that this approach seemed unsafe. I couldn't determine whether there was en_US or en_US.UTF-8 on the client computer running the code. Fortunately, I saw a comment in the document, which can be replaced by gmdate. This function is not affected by the setlocale result:
gmdate('D, d M Y H:i:s') . ' GMT';
Case closed~ Although the requirements are small, it is not easy to write well, and we will have to work harder in the future.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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