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

http://facebook.com/add.php?api_key=[YOUR_APP_KEY]&pages=1&page=[YOUR_PAGE_ID]

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

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

SELECT a.* FROM a INNER JOIN b ON CAST(a.field AS CHAR) = CAST(b.field AS CHAR)

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

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">
	<form>
	<thead>
		<tr>
			<th>Title</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td><input type="text" name="dynamic[]"></td>
		</tr>
	<tbody>
	<tfoot>
		<tr>
			<td><input type="button" id="addmore"></td>
		</tr>
	</tfoot>
	</form>
</table>

JS:

$(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:

	

		

			

				

					Title