


JSON Advanced Part 1: Using JSON_PHP Tutorial in PHP and JavaScript
one. Introduction to JSON
JSON (JavaScript Object Notation) is a lightweight data exchange format. Easy for humans to read and write. It is also easy for machines to parse and generate. JSON uses a completely language-independent text format, but also uses conventions similar to the C language family (including C, C++, C#, Java, JavaScript, Perl, Python, etc.). These properties make JSON an ideal data exchange language. For a detailed explanation of JSON, please visit the JSON official website. There are pictures and facts on this website. It is recommended to study it carefully. In addition, the introduction of JSON on Wikipedia is also very detailed, you can visit it.
two. JSON encoding in PHP
It is very easy to generate JSON strings in PHP. You can directly use the json_encode() function to convert PHP data into JSON strings. The prototype of this function is as follows:
string json_encode (mixed $value)
This function can transcode any data, except resource types.
three. Javascript parses JSON
There are two methods: one is to use the eval() function directly. This method is the fastest. However, since the eval method can also execute arbitrary JavaScript code, security issues may arise when the data source is unreliable. For example, the following example will cause the page to be redirected:
[html] view plaincopy
A piece of JSON data that uses eval() to interpret will cause the page to be redirected
The second method can prevent the occurrence of unsafe code - read JSON data through the JSON.parse(str) method natively supported by the browser. This method uses a parser to verify whether the read code is really JSON code, thus providing better security. However, since this is read in a simulated manner, it will be slower than eval().
Four. JSON example
The following uses an example to explain how data is encoded into a JSON string, and how the JSON string is parsed and used in JavaScript. The program is divided into json1.php and json1.html. The program also needs to reference Smarty, JQuery and JSON library files.
1. json1.php
[php] view plaincopy
// by MoreWindows( http://blog.csdn.net/MoreWindows )
require_once ('../../smarty_libs/Smarty.class.php');
$tpl_article_array = array(
"001" => array(
"title"=>"Access MySql Database with PHP - Elementary",
"link"=>"http://www.BkJia.com/kf/201112/115227.html"
),
"002" => array(
"title"=>"PHP Access MySql Database Intermediate Smarty Technology",
"link"=>"http://www.BkJia.com/kf/201112/115229.html"
),
"003" => array(
"title"=>"PHP Access MySql Database Advanced AJAX Technology",
"link"=>"http://www.BkJia.com/kf/201112/115230.html"
),
);
$tpl_article_json = json_encode($tpl_article_array);
$tpl = new Smarty();
$tpl->assign("article_array", $tpl_article_array);
$tpl->assign("article_json", $tpl_article_json);
$tpl->display("json1.html");
?>
2. json1.html
www.2cto.com
[html] view plaincopy
{foreach $article_array as $key=>$value}
{$value['title']}
{/foreach}
运行结果如下(Win7+IE9.0):

当鼠标经过三个标题时,会触发mouseenter事件显示提示语句。
下一篇《JSON进阶第二篇AJAX方式传递JSON数据》将介绍如何用AJAX动态请求得到JSON数据并生成标题及提示语句。
转载请标明出处,原文地址:http://blog.csdn.net/morewindows/article/details/7197971

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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