Useful Programming: 2013

Friday 26 July 2013

Getting Random values from Array

To Get Random Values from Array :

$arr = array("a"=>"apple","b"=>"ball","c"=>"cat","d"=>"dog" );

shuffle($arr);

Eg :

Before Shuffle :

Array ( [a] => apple [b] => ball [c] => cat [d] => dog )

After Shuffle :

Array ( [0] => ball [1] => cat [2] => apple [3] => dog1 ) // will change order every time we refresh the page

To Pick Random Key from Array :

Eg : picking 2 random keys from an array

$val = array_rand($arr,2);

print_r($val);

Array ( [0] => b [1] => d )

Converting Object to Array

Convert all objects to Array :

function objectToArray( $object ) {
if( !is_object( $object ) && !is_array( $object ) ) {
return $object;
}
if( is_object( $object ) ) {
$object = (array) $object;
}
return array_map( 'objectToArray', $object );
}

(or)

function object_to_array($data)
{
if (is_array($data) || is_object($data))
{
$result = array();
foreach ($data as $key => $value)
{
$result[$key] = object_to_array($value);
}
return $result;
}
return $data;
}

Converting First object to Array :

function app_convertObjectToArray($objectValue) {
if (is_array ( $objectValue )) {
$arrayValue = $objectValue;
} else {
$arrayValue = array ();
if (isset ( $objectValue )) {
array_push ( $arrayValue, $objectValue );
}
}
return $arrayValue;
}

Friday 12 July 2013

To Rewrite example.com to www.example.com using apache

<VirtualHost *:80>
ServerAdmin admin@example.com
DocumentRoot /opt/data/www/example.com
ServerName example.com
ServerAlias www.example.com
RewriteEngine on
RewriteCond %{HTTP_HOST} ^example.com$ [NC]
RewriteRule (.*) http://www.example.com$1 [R=301,L]
CustomLog /var/log/httpd/example.com_access.log combined
</VirtualHost>

Refer for more :

https://my.bluehost.com/cgi/help/htaccess_redirect

http://httpd.apache.org/docs/current/rewrite/proxy.html

Monday 24 June 2013

Checking the uploading image size without submitting the form / Posting the upload file details without submitting the form

html:
--------

<form id="upload_form" >
      <input type="file" class="file" name="filename[]" onchange="validateFileSize()" />
</form>

js:
----

function validateFileSize(){
    var form_obj = document.getElementById("upload_form"); //upload_form is a form id
        try{
            var formData = new FormData(form_obj);
            $.ajax({
                url: 'upload.php', //server script to process data
                type: 'POST',
                success: function(data){},
                error: function(data){},
                data: formData,
                cache: false,
                contentType: false,
                processData: false
            });
        }catch(e){
        }
}

upload.php:
-----------------

if (isset($_FILES["filename"]["name"])) {
    try {
           echo "Upload: " . $_FILES["filename"]["name"] . "<br />";
            echo "Type: " . $_FILES["filename"]["type"] . "<br />";
            echo "Size: " . ($_FILES["filename"]["size"] / 1024) . " Kb<br />";
            echo "Temp file: " . $_FILES["filename"]["tmp_name"] . "<br />";
          } catch (Exception $e) {
             print_r($e);
          }
    }

Note : FormData will not work in old browsers and IE
For old browser, we can use iframe

http://stackoverflow.com/questions/166221/how-can-i-upload-files-asynchronously-with-jquery
http://stackoverflow.com/questions/9516251/upload-files-without-refresh-page ===> using iframe

To Override document.write / alternative solution for document.write using javascript

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
hai
<div id="div"></div>

<script>
document.write = function(w) {
document.getElementById("div").innerHTML += w; //w has the write statement from document.write
}

document.write("Hello");
document.write("world");

</script>
</body>
</html>

Getting ViewPort / Device Screen Size using Javascript (subtracting from browser scrollbar size):

Useful Programming