What is JSON?
JavaScript Object Notation (JSON) is a lightweight data-interchange format inspired by the object literals of JavaScript.
JSON values can consist of:
JSON values can consist of:
- objects (collections of name-value pairs)
- arrays (ordered lists of values)
- strings (in double quotes)
- numbers
- true, false, or null
JSON is language independent.
JSON with PHP?
After PHP Version 5.2.0, JSON extension is decodes and encodes functionalities as default.
- Json_encode - returns the JSON representation of values
- Json_decode - Decodes the JSON String
- Json_last_error - Returns the last error occured.
JSON Syntax and Rules?
JSON syntax is derived from JavaScript object notation syntax:
- Data is in name/value pairs
- Data is separated by commas
- Curly braces hold objects
- Square brackets hold arrays
JSON Example
This example is simple phone number validation and once phone number has validated , it will be sent this php page, there we are using the json format related encode data.
Html Page:
<html> <head> <title>JSON Example in Php</title> <script src="js/jquery-1.11.0.min.js"></script> </head> <body> <h1>Json Basic Example</h1> <form name="phone-form" method="post" onsubmit="return validation();"> <input type="text" name="phone" id="phone" value="" > <input type="submit" value="submit" > </form> <div id="outputDisplay"></div>
Javascript Function
<script> function validation(value){ //Phone Number Validations var phone = $('#phone').val(); var specialDigitPattern = /[~`!@#\$%\^&\*()\-_\+=|\\{}\[\]:;"'<>,\?\/\.0123456789]/; //var mailvalidateregex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/; email validation if(phone == ""){ alert("Please enter the phone "); return false; }else if(isNaN(phone)){ alert('Please Enter Valid Phone Number'); return false; } var postdata = 'phone='+phone; var url = 'testphone.php?phone='+phone; $.ajax({ type : "POST", url : url, data : postdata, dataType : "json", success : phonestatus_check, }); return false; } function phonestatus_check(response){ if(response.status == 1){ alert('success'); $("#outputDisplay").css("color","green"); $("#outputDisplay").html(response.message); }else{ alert('failure'); return false; } } //ends </script>
Php Page:
<?php if(isset($_POST['phone'])){ $phonenumber = $_POST['phone']; $responsearray = array();$responsestatus = '1'; if($responsestatus == 1){ $responsearray = array('status' => 1,'message'=> 'Thanks for submitting the Phone Number'); }else{ $responsearray = array('status' => 0,'message'=> 'failure'); } echo json_encode($responsearray); /* $json = json_encode($responsearray); if($_GET['jsoncallback']) exit("{$_GET['jsoncallback']}($json)"); */ } ?>
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