How to export variable data to a JSON file on the server using JavaScript/PHP?

Question

So let's say I have a HTML page and an input box on it. The user will type something in it, then I'll store it as a variable in JS, and then, can I somehow write the data of that variable to an already existing JSON file on the server?

How can I achieve this using JavaScript and/or PHP?

EDIT: I actually want to know how to write the data of a PHP variable to a JSON file that is in the same directory as the PHP file.

JS (clientside) can get that variable and handle it, but only a serverside language (PHP) can write to a file. There are many ways to do this, but all of them consist in sending that value to the server (via a form submit, or Ajax) and handling the file modification serverside(get that $_POST or $_GET variable and handle it). — blex
– blex, Commented Aug 11, 2015 at 21:25
That's exactly what I want. I want to know how to write the data of a php variable to a json file that is in the same directory as the .php file itself. — bool3max
– bool3max, Commented Aug 11, 2015 at 21:25
Ok, then, post what you have so far. Were you able to send the variable back to your PHP already, or not yet? — blex
– blex, Commented Aug 11, 2015 at 21:27
$foo = json_decode(file_get_Contents('stuff.json')); $foo['newkey'] = 'newdata'; file_put_contents('stuff.json', json_encode($foo));, basically — Marc B
– Marc B, Commented Aug 11, 2015 at 21:27
@MarcB json_decode(..., TRUE) to get an associative array. php.net/manual/en/function.json-decode.php — blex
– blex, Commented Aug 11, 2015 at 21:29

cagri · Accepted Answer · 2015-08-11 22:49:23Z

1

file_put_contents("json_file.json",json_encode($array));

Result:

{"key":"value","anotherkey":"anothervalue"}

Note: file_put_contents function will overwrite your file!

Edit: appendable:

$array = json_decode(file_get_contents("json_file.json"),true);
$array['your_new_key'] = "your_new_value";
file_put_contents("json_file.json",json_encode($array));

edited Aug 11, 2015 at 22:49

answered Aug 11, 2015 at 21:31

cagri

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6 Comments

bool3max Over a year ago

One question though, is there a php function that doesn't overwrite the current content of the file? Thanks.

cagri Over a year ago

file_put_contents("json_file.json",json_encode($array), FILE_APPEND);

blex Over a year ago

But simply appending it will produce invalid JSON -> {"foo":"bar"}{"x":"z"}

cagri Over a year ago

@blex yes, you are right :) i writing another code for you

cagri Over a year ago

$array = json_decode(file_get_contents("json_file.json"),true); $array['your_new_key'] = "your_new_value"; file_put_contents("json_file.json",json_encode($array));

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