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How to Properly Test if jQuery is Loaded

Dan — Fri, 05 Mar 2010 19:49:26 +0000

I saw many people claiming you can test for the existence of jQuery like this:

if (jQuery) {
	// jQuery exists, put code here
} else {
	// jQuery not loaded, put code here
}

This is incorrect. It will work fine if jQuery is loaded, but if it's not loaded, javascript will throw an error and the code to execute if jQuery is not loaded will probably not be processed. The modification to fix this is simple:

if (window.jQuery) {
	// jQuery exists, put code here
} else {
	// jQuery not loaded, put code here
}

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MySQL Select Count Distinct – Counting and Identifying Duplicate Records

Dan — Fri, 22 Jan 2010 03:23:10 +0000

Looking for a [relatively] quick way to identify duplicate records in a table and list how many records there are for each duplicate? Look no further.

In my case, I’ve got a table named Searches which tracks queries on one of my sites. I wanted to check the top queries, so I used this SQL statement:

SELECT COUNT(*) AS repetitions, Query
FROM Searches
GROUP BY Query
HAVING repetitions > 1
ORDER BY repetitions DESC;

There you have it. A simple, effective way to count and label duplicate records.

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30 Google Wave Invites

Dan — Thu, 19 Nov 2009 01:44:50 +0000

I've got 30 more Google Wave invites to give away. Leave a comment with your email and I'll send them. First come, first serve.

This is actually a nomination and it may take a little while before you get your actual invite.

From now on, you must retweet the bitly URL (http://bit.ly/2rwYsG) on twitter and reply to me in order to get an invite.

Example tweet:

@xoise Free Google Wave invites: http://bit.ly/2rwYsG #GoogleWave

Then put a comment in the comment section and don't forget your email (doesn't have to be public).

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How to retrive Yahoo Backlinks count with PHP

Dan — Sun, 08 Nov 2009 19:38:27 +0000

Here's a simple script to retrieve the approximate number of backlinks Yahoo has for a site. The function and how to call it follows:

function get_yahoo_backlinks_count($url) {
	$appid = ''; // get this from https://developer.apps.yahoo.com/wsregapp/
	$url = "http://search.yahooapis.com/WebSearchService/V1/webSearch?appid=$appid&query=site:$url&results=1";
 
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_REFERER, 'http://www.yoursite.com/');
	$response = curl_exec($ch);
	curl_close($ch);
 
	$xml = simplexml_load_string($response);
	return $xml -> attributes() -> totalResultsAvailable;
}
 
echo get_yahoo_backlinks_count('google.com');

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How to retrieve Google Backlinks count with PHP

Dan — Sun, 08 Nov 2009 19:12:06 +0000

Here's a simple script to retrieve the approximate number of backlinks Google has for a site. The function and how to call it follows:

function get_google_backlinks_count($url) {
	$url = "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=site:$url"
 
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_REFERER, 'http://www.yoursite.com/');
	$response = curl_exec($ch);
	curl_close($ch);
 
	$json = json_decode($response);
	return $json ->; responseData ->; cursor -> estimatedResultCount;
}
 
echo get_google_backlinks_count('yahoo.com');

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Simple PHP script for unzip function

Dan — Tue, 27 Oct 2009 04:38:31 +0000

Here’s a simple PHP function to unzip a ZIP file and retain directory structure – great for use when you can’t use exec(). The function will return false on error and true on success. Call it with the following code:

if (unzip('../mtm.zip'))
	echo 'Cool, it worked!';
else
	echo 'Uh oh, something went wrong.';

function unzip($zipfile) {
	$zip = zip_open($zipfile);
	if ($zip) {
		while ($item = zip_read($zip)) {
			$name = zip_entry_name($item);
			if (substr($name, -1) == '/') {
				if (!file_exists($name)) {
					$dir = mkdir($name);
					if (!$dir) {
						zip_close($zip);
						return false;
					}
				}
			} else {
				if (zip_entry_open($zip, $item, "r")) {
					$f = file_put_contents($name, zip_entry_read($item, zip_entry_filesize($item)));
					zip_entry_close($item);
					if ($f === false) {
						zip_close($zip);
						return false;
					}
				} else {
					zip_close($zip);
					return false;
				}
			}
		}
		zip_close($zip);
		return true;
	}
	return false;
}

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How to easily display errors in PHP scripts

Dan — Mon, 26 Oct 2009 23:51:01 +0000

Put the following two lines of code before any PHP code you want to display errors for.


ini_set('display_errors', 'on');
error_reporting(E_ALL);
?>

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How to Duplicate Database Rows in MySQL

Dan — Wed, 21 Oct 2009 23:14:42 +0000

If you're looking for a quick, easy way to duplicate a MySQL Row, try the following example:

INSERT INTO Tbl1
		(Col2, Col3, ...)
	SELECT
		(Col2, Col3, ...)
	FROM Tbl1
		WHERE Col1 = 1;

This example assumes you want to duplicate the row where Col1 equals 1. You could change the where clause to anything for that matter. However, if there are more than one rows selected from the SELECT statement, it will INSERT each row, not just one.

Likewise, you could duplicate a whole MySQL table using the following:

INSERT INTO Tbl2
		(Col2, Col3, ...)
	SELECT
		(Col2, Col3, ...)
	FROM Tbl1;

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Free Google Wave Invites

Dan — Tue, 06 Oct 2009 05:27:19 +0000

Hey, I’ve got 8 Google Wave invites to give out. If you want one, hit me up. It’ll be a first come, first serve sort of deal!

Shoot me an email or leave a comment.

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How to mount Amazon EC2 EBS volume on an instance’s file system

Dan — Wed, 30 Sep 2009 23:45:48 +0000

The following assumes you have created a volume in AWS Management Console and attached it to your instance as /dev/sdh.

A brand new volume is unformatted block storage. It shows up as another device, but doesn’t contain a filesystem. (An EBS volume that previously had a filesystem created on it won’t be mounted either by the attachment process).

You can verify that your instance can see the EBS volume by running the following command on the instance:

cat /proc/partitions

You’ll see an entry for sdh. At this point, you should create a filesystem and mount it manually. You could create an EXT3 filesystem on the device and then mount it on ‘/mnt/ebs’ with the following commands, (run as root):

mke2fs -F -j /dev/sdh

mkdir /mnt/ebs

mount /dev/sdh /mnt/ebs

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