Restrict the file uploads using PHP

Below is the php code to restrict the file uploads for a particular type of files. As an example, I'm showing all the extension types in the "Allowed extensions" variable.


<?php

  $allowedExtensions = array("txt","csv","htm","html","xml",
    "css","doc","xls","rtf","ppt","pdf","swf","flv","avi",
    "wmv","mov","jpg","jpeg","gif","png");
    if ($_FILES['upload_file']['tmp_name'] > '') {
      if (!in_array(end(explode(".",
            strtolower($_FILES['upload_file']['name']))),
            $allowedExtensions)) {
       die($_FILES['upload_file']['name'].' is an invalid file type!<br/>'.
        '<a href="javascript:history.go(-1);">'.
        '&lt;&lt Go Back</a>');
      }
    }

?>

Remove the special characters from the query string

Function to remove the special characters from the query string using PHP.

function trim_req($string){
$string=preg_replace('/[^A-Za-z0-9-]+/', '', $string);
$string = str_replace("<", "", $string);
$slug = str_replace(">", "", $string);
return $slug;
}

Change the color of selected text in a browser for ur site

Below is the css Code to change the default color of the selected text as shown in the below screen shots.

::-moz-selection{ background: #DA3E34; color:#fff; text-shadow: none; }

::selection { background:#DA3E34; color:#fff; text-shadow: none; }

Compress & decrease the page loading time using HTACCESS

Place the below code in htaccess & decrease the loading time taken for the browser.

<IfModule mod_gzip.c>

    mod_gzip_on       Yes

    mod_gzip_dechunk  Yes

    mod_gzip_item_include file      \.(html?|txt|css|js|php|pl)$

    mod_gzip_item_include handler   ^cgi-script$

    mod_gzip_item_include mime      ^text/.*

    mod_gzip_item_include mime      ^application/x-javascript.*

    mod_gzip_item_include mime      ^image/.*

    mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*

</IfModule>

Above code will compress the HTML,CSS,JS,PHP,PL script files and also image files. 

count of checkboxes selected using javascript

Below is the code to know the number of checkboxes selected in a form. The function returns the total count of the Checkbox checked.

<script type="text/javascript">
function anyCheck(form) {
var total = 0;
var Count = document.playlist.count.value;
for (var idx = 1; idx < Count; idx++) {
if (eval("document.playlist.ckbox" + idx + ".checked") == true) {
total += 1;
}
}
alert("You selected " + total + " boxes.");
}
</script>
<form method="post" name=playlist>
1<input type=checkbox name=ckbox>
<br>2<input type="checkbox" name="ckbox1" onchange="anyCheck(this.value)">
<br>3<input type="checkbox" name="ckbox2" onchange="anyCheck(this.value)">
<br>4<input type="checkbox" name="ckbox3" onchange="anyCheck(this.value)">
<br>5<input type="checkbox" name="ckbox4" onchange="anyCheck(this.value)">
<br>6<input type="checkbox" name="ckbox5" onchange="anyCheck(this.value)">
<br>7<input type="checkbox" name="ckbox6" onchange="anyCheck(this.value)">
<br>8<input type="checkbox" name="ckbox7" onchange="anyCheck(this.value)">
<br>9<input type="checkbox" name="ckbox8" onchange="anyCheck(this.value)" >
<input type="hidden" value="8" name="count">
</form>