Table of Contents
Introduction
Whatever we see on our website, it is either saved within HTML or being fetched from a table. The HTML has a script file attached with it which calls backend, where SQL codes are written. These SQL codes interact with database. In this article we will learn how to send a response in PHP. There are different ways to send response via PHP APIs, we will showcase the one that can be used in all types of CRUD operations here.
Syntax
// to send an array of data in respone echo json_encode(<array variable>); // to send a string Echo ‘<Your string>’; // to send error of SQL echo json_encode(mysql_error()); or echo $conn->error
How to send a response in PHP
As discussed in above use cases, we can send as below:
| Error Type | Example |
| String | echo ‘Operation successful’; |
| Array | $dataArray[0] = ‘Insertion successful’; echo json_encode($dataArray); |
| Object | echo json_encode(mysql_error()); |
Getting PHP response in frontend
As you have seen above that a response can be of different type, hence in UI you will have to handle the response accordingly.
In case it is a string, you can print it directly.
In case of array you need to print the value at given position, e.g. response[0].
In case of object you need to print the value after parsing it with the help of keys.
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