


First of all, we must understand that we cannot do weather forecasting by ourselves. Here we only need to call the data returned by the API interface. The following is an example of calling the API interface of China Weather Network for us to learn together. Weather has become an indispensable topic in life and is closely related to our lives. On the right side of my blog, I made a small weather query module using php+ajax.
The ideal state should be for users to automatically obtain local weather information based on different places they visit. However, the technology is currently limited and can only be completed manually. This is much simpler and does not use too many technologies. It mainly uses ajax to call an open interface and then processes the returned json data.
Interface address: http://www.weather.com.cn/data/cityinfo/101200101.html
Returned value: {"weatherinfo":{"city":"Wuhan","cityid":"101200101","temp1":"28℃","temp2":"36℃", "weather":"Sunny to cloudy","img1":"n0.gif","img2":"d1.gif","ptime":"18:00"}}
The interface address part is "101200101". This string of ID numbers is the city ID. I went to Baidu to get the ID corresponding to the city, and then encapsulated it into an array. When using it, just call it directly. There is not much core code, mainly cities - IDs are relatively large, so I won’t post the source code, just package it and share it. Friends who need it can download it directly!
Part of the code
The code is as follows | Copy code | ||||
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getweather.php文件
代码如下 | 复制代码 | ||||
为、 ![]() $city = $_POST['city']; $citycode = @$citycode[$city]; //echo "shibushi"; if(empty($citycode)){ echo "您输入的城市不在范围内"; }else{ echo file_get_contents("http://www.weather.com.cn/data/cityinfo/".$citycode.".html"); } ?> |
测试效果
源码下载:php ajax实现无刷新获取天气状态源码下载:
TechArticle
php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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