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Read more How to add application to facebook fans page

Easily use the following url to add your app to any fans page you have manage right.


Read more Verify email address by PHP filter_var

To check an email address is valid or not, we always use preg_match. Today I found that php5 has already allow a function to do so, which is filter_var

filter_var($email, FILTER_VALIDATE_EMAIL)

However, most checking script include filter_var doesn't well checking the domain part. For example, an email xxx@xxx.com1 can pass the validation but .com1 is a invalid domain name, so I add some code to the function to imporve the function as below.

function verifyEmail($email) {
	if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
		return preg_match('/^([a-z]{2,4})$/', end(explode('.',$email)));
	return false;

Note: I have set 2-4 letter in the last part of the domain, but you may know there exists some special domain will not pass the validation (such as .travel, .museum)

filter_var also allow some more checking function, such as FILTER_VALIDATE_URL, FILTER_VALIDATE_IP, you may read detail on php.net

Read more JOIN table by varchar fields - Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_genera

Usually, we will using integer fields to join two table, however, today I have a case need to use a varchar field to join the tables and then get the error "Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation", search the error on google and finally I got the solution as below


Read more Detect browser support HTML5 drag and drop by javascript

if('draggable' in document.createElement('span')) {
  alert("Drag support detected");

Read more JS added new input does not post

On developing a submition form, we will sometimes need a variable number of input for some options. In the case we usaully use jquery/js to dynamically add input fields to the form. However, today I face on a problem that the jquery added input does not post to the server side. Finally, I find the reason is related to the strcture of the html.

the html of my code

<table id="table">
			<td><input type="text" name="dynamic[]"></td>
			<td><input type="button" id="addmore"></td>


$(document).ready(function() {
	$("#addmore").click(function() { $("tbody",$("#table")).append(''); });

The reason cost the problem is the order of form and table. In the case, I have put the form inside the table which will make the added input not catch by the form, simply change to the following and the problem solve:

1 2 3 4 5 6 7 8 9 10