Replace data into json file using PHP and javascript

Question

I have a json file (file1.json) which contain json data. I would like to replace these data by new datas (newDataToStore).

I don't know how to do it using a php file (save.php file below) ?

Content of file1.json :

[
  {
    "key" : "test1",
    "desc": "desc1"
  },
  {
    "key" : "test2",
    "desc": "desc2"
  },
]

New json to write into json1.json file :

var newDataToStore = 
[
  {
    "key" : "test2",
    "desc": "desc2"
  },
  {
    "key" : "test3",
    "desc": "desc3"
  },
];

JS

this.save = function (newDataToStore) {
    jQuery.ajax({
        type : "POST",
        dataType : "json",
        url : 'save.php',
        data : newDataToStore,
        success : function() {
            console.log("SUCCESS");
        },
        error : function() {
            console.log("ERROR");
        }
   });
}

jbick · Accepted Answer · 2015-08-27 13:42:58Z

5

Another approach:

You'll need to stringify the JS-Object before sending it to the server:

this.save = function (newDataToStore) {
    jQuery.ajax({
        type : "POST",
        dataType : "json",
        url : 'save.php',
        data : {'json': JSON.stringify(newDataToStore)},
        success : function() {
            console.log("SUCCESS");
        },
        error : function() {
            console.log("ERROR");
        }
   });
}

On the serverside your script should do something like (as Mohammad Alabed pointed out):
```
file_put_contents('/path/to/file1.json', $_POST['json']);
```

BUT, beware! Users could write arbitrary data to the file. You should always validate user input on the server side. (Maybe using a json schema)

edited Aug 27, 2015 at 13:42

answered Aug 27, 2015 at 13:08

jbick

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2 Comments

wawanopoulos Over a year ago

Thanks, good piece of code but i get an exception : failed to open stream: Invalid argument on file_put_contents($_POST['json'], 'file1.json');

jbick Over a year ago

file_put_contents has a different order of attributes, sorry. I corrected it.

Mohammad Alabed · Accepted Answer · 2015-08-27 15:09:37Z

1

in php file the json data will be in the post global variable because you use post in your ajax

so all what you need is file_put_contents()

save.php

file_put_contents('file1.json', json_encode($_POST));

by using this function you will write a new json string to your json file (old content will be deleted)

edited Aug 27, 2015 at 15:09

answered Aug 27, 2015 at 12:58

Mohammad Alabed

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Comments

Syed mohamed aladeen · Accepted Answer · 2015-08-27 12:55:59Z

0

in your save.php file

use json_decode()

it will decode your json datas passed from your ajax file

answered Aug 27, 2015 at 12:55

Syed mohamed aladeen

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