Php parse json input

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Catch and parse JSON Post data in PHP
How to Parse JSON in PHP
Reading JSON From a File or String in PHP
Php parse json input
Php parse json input

Catch and parse JSON Post data in PHP

A few days ago I’ve been working a project which, as many other projects out there today, communicates with some external APIs. At some point, in order to perform some tests, I had to write an API endpoint within my project itself to fake the actual external API. I need to mention that the external API was expecting application/json content type, so basically the curl setup looked like this:

timeout_limit ); curl_setopt( $ch, CURLOPT_ENCODING, '' ); curl_setopt( $ch, CURLOPT_MAXREDIRS, 10 ); curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, 'POST' ); curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $data ) ); curl_setopt( $ch, CURLOPT_HTTPHEADER, array( 'Content-Type: application/json' ) ); // .

The issue was that when I’ve been trying to catch the POST data and use it, I was getting null as a value for both $_POST or $_REQUEST , and I couldn’t understand why 🤔. Apparently (and maybe many of you already knew that), if the data is sent as multipart/form-data or application/x-www-form-urlencoded then yes, you can use PHP globals $_POST or $_REQUEST to catch and use that data. But, if the data is sent as application/json , then prior to PHP 5.6 you could’ve use $HTTP_RAW_POST_DATA to grab the raw POST data, or (and based on PHP docs this is the preferable way to do it) use the php://input — a read-only stream that allows you to read raw data from the request body. So, as a result I ended up grabbing the POST data like this:

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How to Parse JSON in PHP

Monty Shokeen Last updated May 31, 2021

JSON, short for JavaScript Object Notation, is a common lightweight format for storing and exchanging information. As the name suggests, it was initially derived from JavaScript, but it is a language-independent format for storing information. A lot of languages like PHP now implement functions to read and create JSON data.

This tutorial will teach you how to read a JSON file and convert it to an array in PHP. Learn how to parse JSON using the json_decode() and json_encode() functions.

Reading JSON From a File or String in PHP

Let’s say you have a file which contains information in JSON format. How do you access and store it in PHP?

First, you need to get the data from the file into a variable by using file_get_contents() . Once the data is in a string, you can call the json_decode() function to extract information from the string. Keep in mind that JSON simply provides a way to store information as a string using a set of predefined rules. It is our job to decode the strings properly and get the information we want.

The json_decode() function accepts four parameters, but you will only need the first two in most situations. The first parameter specifies the string that you want to decode. The second parameter determines how the decoded data is returned. Setting it to true will return an associative array, and false will return objects. Here is a basic example. We have a file called people.json with the following contents:

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