How to store php array in a small program

In the development of small programs, we sometimes need to obtain data from the background interface, and the data may be returned to us in the form of a php array. So, how do we store these php arrays in the applet? This article will introduce in detail how to store php arrays in applet.

1. First of all, we need to understand the form of php array

In php, array is a very common data type that can store multiple values ​​and can Access the corresponding value based on the key name. PHP arrays can be one of the following types:

• Integer-indexed array - When the keys of the array are consecutive integers, it is an integer-indexed array. For example: $arr=array("apple","banana","cherry");
• Associative array - When the keys of the array are strings, it is an associative array. For example: $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
• Multidimensional array - in an array Can contain one or more arrays. For example: $cars=array("Volvo",array("BMW","Toyota"),array("Honda"));

2. Use wx.setStorageSync() method to store php array

The applet provides the wx.setStorageSync() method to implement local storage of data. We can use this method to store php arrays. The specific operation steps are as follows:

• After receiving the php array, first convert it into a JSON string.
• Call the wx.setStorageSync() method to store the JSON string locally.
• Where a php array is required, read JSON string data locally and then parse it into a php array.

The sample code is as follows:

//Receive php array
var phpArr = ['apple', 'banana', 'cherry'];

//Convert php array to JSON string
var jsonStr = JSON.stringify(phpArr);

//Storage JSON string to local
wx.setStorageSync('phpArr', jsonStr );

//Read JSON string from local
var savedJsonStr = wx.getStorageSync('phpArr');

//Parse JSON string into php array
var savedPhpArr = JSON.parse(savedJsonStr);

console.log('php array read from local:', savedPhpArr);

3. Notes

In actual development, you need to pay attention to the following points:

• The JSON.stringify() and JSON.parse() methods must be used in pairs to ensure the data type when storing and reading consistency.
• The local storage of the mini program has a size limit, and the maximum amount of data allowed to be stored in a single key cannot exceed 10MB.
• The stored data is written into the storage of the user's mobile phone. If not necessary, it is best to avoid storing sensitive data.
• If you need to clear the stored data, you can call the wx.clearStorageSync() method.

Summary

This article introduces how to store php arrays in small programs by converting them into JSON strings. Special attention needs to be paid to stored data size limits and data type consistency. For small program development, proficiency in local storage methods can help us process data more efficiently and conveniently, and improve development efficiency.

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