


PHP analysis of JSON operation examples, phpjson example analysis
This article analyzes PHP JSON operations through examples. Share it with everyone for your reference. The specific analysis is as follows:
Since JSON can be used in many programming languages, we can use it for small data transfer, such as: PHP outputs JSON strings for use by JavaScript, etc. In PHP, you can use json_decode() to parse a JSON object from a string of standardized strings, and use json_encode() to generate a string of standardized strings from a JSON object.
Example:
var_dump(json_decode($json));
var_dump(json_decode($json,true));
Output:
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
array(5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
echo json_encode($arr);
Output: {"a":1,"b":2,"c":3,"d":4,"e":5}
1. json_decode(), convert characters to JSON, generally used when receiving data sent by Javascript.
$web=json_decode($s);
echo 'Website name:'.$web->webname.'
Web address: '.$web->url.'
Contact information: QQ-'.$web-> ;contact->qq.' MAIL:'.$web->contact->mail;
?>
In the above example, we first define a variable s, and then use json_decode() to parse it into a JSON object, which can then be used in the same way as JSON. From the usage point of view, JSON has similar functions to XML and array implementation. Both can store some data that are related to each other, but I personally feel that JSON is easier to use, and data sharing can be achieved using JSON and JavaScript.
2. json_encode(), JSON to character conversion, this is generally used in AJAX applications to convert JSON objects into strings and output them to Javascript, and is also used when storing in the database.
$web=json_decode($s);
echo json_encode($web);
?>
2.PHP JSON to array
$web=json_decode($s); //Convert characters to JSON
$arr=array();
foreach($web as $k=>$w) $arr[$k]=$w;
print_r($arr);
?>
In the above code, a JSON object has been converted into an array. However, if it is a nested JSON, the above code is obviously unable to do anything. Then we write a function to solve the nested JSON,
$web=json_decode($s);
$arr=json_to_array($web);
print_r($arr);
function json_to_array($web){
$arr=array();
foreach($web as $k=>$w){
If(is_object($w)) $arr[$k]=json_to_array($w); //Determine whether the type is object
else $arr[$k]=$w;
}
return $arr;
}
?>
I hope this article will be helpful to everyone’s PHP programming design.

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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