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Get convert currency in codeigniter


convert.php(controller)

  <?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Convert extends CI_Controller {
	public function __construct()
    {
		parent::__construct();
		/* if ($this- >session- >userdata('logged_in') != 1){
			redirect('home');
		} */
    }
	public function index(){
		
		$this- >load- >view('index.php');
	}
	public function convert(){
		function currencyConverter($fromCurrency,$toCurrency,$amount) {	
		$fromCurrency = urlencode($fromCurrency);
		$toCurrency = urlencode($toCurrency);	
		$encode_amount = 1;
		$url  = "https://www.google.com/search?q=".$fromCurrency."+to+".$toCurrency;
		$get = file_get_contents($url);
		$data = preg_split('/\D\s(.*?)\s=\s/',$get);
		$exhangeRate = (float) substr($data[1],0,7);
		$convertedAmount = $amount*$exhangeRate;
		$data = array( 'exhangeRate' = > $exhangeRate, 'convertedAmount' = >$convertedAmount, 'fromCurrency' = > strtoupper($fromCurrency), 'toCurrency' = > strtoupper($toCurrency));
		echo json_encode( $data );	
	}
	if(1==1) {
	$from_currency = trim($_POST['from_currency']);
	$to_currency = trim($_POST['to_currency']);
	$amount = trim($_POST['amount']);	
	if($from_currency == $to_currency) {
		$data = array('error' = > '1');
		echo json_encode( $data );	
		exit;
	}
	$converted_currency=currencyConverter($from_currency, $to_currency, $amount);
	echo $converted_currency;
	}
			
}

index.php

<!DOCTYPE html >
 <html >
	 <head >
	    <title >Current Weather </title >
	 </head>
 <body>
<div class="card">
<div class="card-body">
	<div class="text-dark font-size-18 font-weight-bold mb-1" >Currency XE </div>
	<form method="post" id="currency-form"> 		
	<div class="form-group" >
	<label >From </label>
		<select name="from_currency" class="form-control">
			<option value="INR" >Indian Rupee </option>
			<option value="USD" selected="1" >US Dollar </option>
			<option value="AUD" >Australian Dollar </option>
			<option value="EUR" >Euro </option >
			<option value="EGP" >Egyptian Pound </option>
			<option value="CNY" >Chinese Yuan </option>
		</select >	
		  <label >Amount </label>	
			<input type="text" placeholder="Currency" name="amount" class="form-control" id="amount" />			
		  <label >To </label >
		<select name="to_currency" class="form-control">
			<option value="INR" selected="1" >Indian Rupee </option>
			<option value="USD" >US Dollar </option>
			<option value="AUD" >Australian Dollar </option>
			<option value="EUR" >Euro </option >
			<option value="EGP" >Egyptian Pound </option>
			<option value="CNY" >Chinese Yuan </option>
		</select>
		<br>
		<button type="button" name="convert" id="convert" class="btn btn-default" >Convert</button>

		</div>			
		</form>	
	<div class="form-group" id="converted_rate" > </div>	
<div id="converted_amount"> </div>
	</div>
	</div>
	 $('document').ready(function() { 
	  
	/* Handling Currency Convert functionality */
$('#convert').on('click', function() {
var data = $("#currency-form").serialize();	

$.ajax({				
	type : 'POST',
	url  : 'http://localhost/trading_new/Dashboard/convert',
	dataType:'json',
	data : data,
	beforeSend: function(){	
		$("#convert").html(' <span class="glyphicon glyphicon-transfer" > </span >   converting ...');
	},
	success : function(response){
	//alert(response);
	if(response.error == 1){	
		$("#converted_rate").html(' <span class="form-group has-error" >Error: Please select different currency </span >'); 
		$("#converted_amount").html("");
		$("#convert").html('Convert');
		$("#converted_rate").show();	 
	} else if(response.exhangeRate){									
		$("#converted_rate").html(" <strong >Exchange Rate ("+response.toCurrency+" </strong >) : "+response.exhangeRate);
		$("#converted_rate").show();
		$("#converted_amount").html(" <strong >Converted Amount ("+response.toCurrency+" </strong >) : "+response.convertedAmount);
		$("#converted_amount").show();
		$("#convert").html('Convert');
	} else {	
		$("#converted_rate").html("No Result");	
		$("#converted_rate").show();	
		$("#converted_amount").html("");
	}
	}
});
});	

});
 </body >
 </html >