PHP Tutorial: How To Convert JSON API Request

Converting JSON API Data To PHP Array

Using current STEEM price from Coin Market Cap API for a form by parsing data into a PHP array, then assigning to a variable.

Parsing the Data

First, you'll want to read your JSON output by visiting the link you will get your data from. Determine if it is a multi-dimensional array or just a single array of values. Also, look for the key-value pairs you will be using; price_usd in our case.

Decode the JSON data and reference your key-value pairs using the multi-dimensional array and assign the data to a variable (if only using one pair).

$steemprice = $steemjson[0][price_usd];

Multiple data sets can be referenced in the same way just using the array variable reference [and a for loop].

//Steem price in BTC
echo $steemjson[0][price_btc];
// 1 hour change in percentage
echo $steemjson[0][percent_change_1h];

Spit Out The Results

You can use echo, print or print_r to display your results on screen in PHP. There is another shortcut that we used in the video.

<?=$steemprice?>

• same as -

<? echo $steemprice; ?>

Another method, print_r is used like var_dump, it outputs all the data from the array.

References: Coin Market Cap API: https://coinmarketcap.com/currencies/steem/#tools
File Used on CoinThru.com: https://cointhru.com/steem/income-calculator.php

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