1) JSON stands for JavaScript Object Notation
Example of JSON string
s1 = '{"FirstName":"David", "LastName":"Lee"}'
It defines an object with 2 properties: FirstName and LastName
JavaScript has a built in function for converting JSON strings into JavaScript objects:
obj = JSON.parse(s1)
After we parse the JSON string with a JavaScript program, we can access the data as an object:
let FirstName = obj.FirstName;
let LastName = obj.LastName;
JavaScript also has a built in function for converting an object into a JSON string:
JSON.stringify()
2) PHP json_encode function
convert PHP array to JSON string
Example:
<?php
$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($arr);
?>
The above example will output:
{"a":1,"b":2,"c":3,"d":4,"e":5}3) PHP json_decode function
json_decode — Decodes a JSON string to an object
<?php
$json = '{"foo-bar": 12345}';
$obj = json_decode($json);
print $obj->{'foo-bar'}; // 12345
?>
3) Example in PHP Larvel
in controller
$dataItems['FirstName'] = "David";
$data['dataItems'] = json_encode($dataItems);
return view('templates.view_layout', $data);
in view: view_layout.blade.php
@isset($dataItems)
<script type="text/javascript">
var dataItems = {!! $dataItems !!};
</script>
@endisset
Parse to JavaScript object, which can be used it React.js
constructor(props) {
super(props);
this.state = {
data: dataItems ? dataItems : null,
}
}
//Access to FirstName
this.state.data.FirstName;
