Category Archives: WordPress

Of PHP, Wordpress and other geeky stuff.

How to Start an Internet Business

Starting a business online is easier than you think. Succeeding in one is another story, of course. First of all, you need a product or service, which had better be something that people want. In my experience, what people want most is to make money. Anything that helps them make money is a good product. Second, you need a way of collecting money and delivering the product or providing the service in return for payment. Third, you need to get visibility.

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MySQL on Mac OSX Yosemite

If you use XAMPP for dev work on your Mac at home, and updated your OS to Yosemite, you may be temporarily distressed when you find that your MySQLd doesn’t start up. The fix is fairly simple.

Edit /Applications/XAMPP/xamppfiles/xampp. (You may have to use sudo to do this.)

Look for:

$XAMPP_ROOT/bin/mysql.server start > /dev/null &

And add unset DYLD_LIBRARY_PATH on top of it. It should look like:

unset DYLD_LIBRARY_PATH
$XAMPP_ROOT/bin/mysql.server start > /dev/null &

Restart MySQLd and you it should work.

Back to Blogging

As you may have noticed, I haven’t been writing much in the last couple of months. It was because of one of my regularly scheduled writer’s blocks. When I’m blocked, I usually find other things to do, and convince myself that they are really important and urgent. One such thing this time around was a revamping of my blog backend. The original design was dated, and it really needed an upgrade. Or so I told myself and worked on it for a few weeks. If you are reading this post, you can see the fruits of my labor. And I hope you like it.

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High Performance Blogs and Websites

Do you have a website or a blog and feel that it is getting bogged down with heavy traffic? First of all, congratulations — it is one of those problems that webmasters and bloggers would love to have. But how would you solve it? The first thing to do is to enable PHP acceleration, if your site/blog is PHP based. Although it should be straightforward (in theory), it might take a while to get it right. You know what they say — In theory, theory and practice are the same. In practice, they are not. Acceleration, however, is a low-hanging fruit, and will go a long way in solving your problems.

Once you have extracted all the mileage out of the accelerator solution, it is time to incorporate a Content Delivery Network or CDN. What a CDN does is to serve all your static files (images, style sheets, javascript files, and even cached blog pages) from a network of servers other than your own. These servers are strategically placed around the continent (and around the globe) so that your readers receive the content from a location geographically close to him. In addition to reducing the latency due to distance, CDN also helps you by reducing the load on your server.

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Learn to Play Blackjack

Here is an online Blackjack game that will teach you how to play it. If you don’t know what to do, just ask the program! This post hopefully teaches you sound strategies in playing Blackjack. But you should know that even with the soundest of strategies, Blackjack is a losing game. The house always holds a small edge. The best any strategy can do for you is to increase your staying powerthe time it takes you to lose your shirt.

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Battles Too Small to Fight

A few years ago, I had significant income from online advertising because of my networked business model that worked extremely well at that time. At one point the ad serving company decided to cancel my account because some sites in my network violated their terms and conditions. They told me that they couldn’t pay me for the last two months because they had already refunded the money to the advertisers who were outraged at my T & C violations. Mind you, it was a small fortune. But a couple of months later, they decided to reinstate me. The first thing they did after reactivating my account was to pay me my outstanding balancethe money they hadrefundedto their disgruntled advertisers. I, of course, was quite gruntled about the outcome. But the joy didn’t last; they banned me again a month later.

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We Are Moving…

Unreal Blog has moved to a more powerful server at Arvixe. [Disclosure: All the server links in this article are affiliate links.] For those interested in moving your hosting to a new server, I thought I would describe the “gotchas” involved.

This gotcha got me during a test migration of my old posts to the new server. I had over 130 posts to migrate. When I moved them to the new blog on the new server, they looked like new posts. To the unforgiving logic of a computer (that defies common sense and manages to foul up life), this pronouncement of newness is accurate, I have to admit — they were indeed new posts on the new server. So, on the 10th of January, my regular readers who had signed up for updates received over 100 email notifications about “new posts” on my blog. Needless to say I started getting angry emails from my annoyed regulars demanding that I remove their names from my “list.excessive” (as one of them put it). If you were one of those who got excessive emails, please accept my apologies. Rest assured that I have turned off email notifications, and I will look and hard into the innards of my blog before turning it back on. And when I do turn it on, I will prominently provide a link in each message to subscribe or unsubscribe yourself.

As you grow your web footprint and your blog traffic, you are going to have to move to a bigger server. In my case, I decided to go with Arvixe> because of the excellent reviews I found on the web. The decision of what type of hosting you need makes for an interesting topic, which will be my next post.

Blank Screen after Hibernate or Sleep?

Okay, the short answer, increase your virtual memory to more than the size of your physical memory.

Long version now. Recently, I had this problem with my PC that it wouldn’t wake up from hibernation or sleep mode properly. The PC itself would be on and churning, but the screen would switch to power save mode, staying blank. The only thing to do at that point would be to restart the computer.

Like the good netizen that I am, I trawled the Internet for a solution. But didn’t find any. Some suggested upgrading the BIOS, replacing the graphics card and so on. Then I saw this mentioned in a Linux group, saying that the size of the swap file should be more than the physical memory, and decided to try it on my Windows XP machine. And it solved the problem!

So the solution to this issue of blank screen after waking up is to set the size of the virtual memory to something larger than the memory in your system. If you need more information, here is how, in step-by-step form. These instructions apply to a Windows XP machine.

  1. Right-click on “My Computer” and hit “Properties.”
  2. Take a look at the RAM size, and click on the “Advanced” tab.
  3. Click on the “Setting” button under the “Performance” group box.
  4. In the “Performance Options” window that comes up, select the “Advanced” tab.
  5. In the “Virtual Memory” group box near the bottom, click on the “Change” button.
  6. In the “Virtual Memory” window that pops up, set the “Custom Size” to something more than your RAM size (that you saw in step 2). You can set it on any hard disk partition that you have, but if you are going through all these instructions, chances are you have only “C:”. In my case, I chose to put it on “M:”.

How to save a string to a local file in PHP?

Αυτή η ανάρτηση είναι η δεύτερη στη σειρά geek μου,,en,Κατά τον προγραμματισμό του Theme Tweaker μου,,en,Βρήκα αυτό το πρόβλημα,,en,Είχα μια συμβολοσειρά στο διακομιστή μου στο πρόγραμμα php μου,,en,το τροποποιημένο φύλλο στυλ,,en,και ήθελα να δώσω στον χρήστη την επιλογή να το αποθηκεύσει σε ένα αρχείο του υπολογιστή του,,en,Θα νόμιζα ότι αυτό ήταν ένα κοινό πρόβλημα,,en,και όλα τα κοινά προβλήματα μπορούν να επιλυθούν με το Googling,,en,Ιδού,,en,Δεν μπορούσα να βρω μια ικανοποιητική λύση,,en,Βρήκα το δικό μου,,en,και σκέφτηκα να το μοιραστώ εδώ,,en,προς όφελος όλων των μελλοντικών Googler που δεν έχουν έρθει και δεν έχουν φύγει,,en,Πριν πάμε στη λύση,,en,ας καταλάβουμε ποιο είναι το πρόβλημα,,en,Το πρόβλημα είναι η κατανομή της εργασίας μεταξύ δύο υπολογιστών,,en,ένας είναι ο διακομιστής,,en,όπου λειτουργούν το WordPress και η PHP,,en.

While programming my Theme Tweaker, I came across this problem. I had a string on my server in my php program (the tweaked stylesheet, in fact), and I wanted to give the user the option of saving it to a file his computer. I would’ve thought this was a common problem, and all common problems can be solved by Googling. But, lo and behold, I just couldn’t find a satisfactory solution. I found my own, and thought I would share it here, for the benefit of all the future Googlers yet to come and go.

Before we go into the solution, let’s understand what the problem is. The problem is in the division of labor between two computers — one is the server, where your WordPress and PHP are running; το άλλο είναι ο υπολογιστής του πελάτη όπου πραγματοποιείται η προβολή,,en,Η συμβολοσειρά για την οποία μιλάμε βρίσκεται στον διακομιστή,,en,Θέλουμε να το αποθηκεύσουμε σε ένα αρχείο στον υπολογιστή του πελάτη,,en,Ο μόνος τρόπος να το κάνετε είναι να εξυπηρετήσετε τη συμβολοσειρά ως απάντηση html,,en,Με την πρώτη ματιά,,en,αυτό δεν μοιάζει με μεγάλο πρόβλημα,,en,Οι διακομιστές στέλνουν τακτικά συμβολοσειρές και δεδομένα σε πελάτες,,en,έτσι βλέπουμε οτιδήποτε στο πρόγραμμα περιήγησης,,en,συμπεριλαμβανομένων όσων διαβάζετε,,en,Αν ήταν οποιοδήποτε πρόγραμμα PHP που θέλει να σώσει τη συμβολοσειρά,,en,δεν θα ήταν πρόβλημα,,en,Θα μπορούσατε απλώς να πετάξετε τη συμβολοσειρά σε ένα αρχείο στο διακομιστή και να εξυπηρετήσετε το αρχείο,,en,Αλλά τι κάνετε αν δεν θέλετε να δώσετε σε ολόκληρο τον κόσμο έναν τρόπο απόρριψης συμβολοσειρών σε αρχεία στον διακομιστή σας,,en,θα μπορούσες να κάνεις κάτι τέτοιο,,en. The string we are talking about is on the server. We want to save it in a file on the client’s computer. The only way to do it is by serving the string as an html reply.

At first glance, this doesn’t look like a major problem. After all, servers regularly send strings and data to clients — that’s how we see anything on the the browser, including what you are reading. If it was just any PHP program that wants to save the string, it wouldn’t be a problem. You could just dump the string into a file on the server and serve the file.

But what do you do if you don’t want to give the whole world a way of dumping strings to files on your server? Well, you could do something like this:

<?php
header('Content-Disposition: attachment; filename="style.css"');
header("Content-Transfer-Encoding: ascii");
header('Expires: 0');
header('Pragma: no-cache');
print $stylestr ;
?>

So, απλά βάλτε αυτόν τον κωδικό στο foo.php που υπολογίζει τη συμβολοσειρά $ stylestr και τελειώσατε,,en,Αλλά το πρόβλημά μας είναι ότι εργαζόμαστε στο πλαίσιο προσθηκών του WordPress,,en,και δεν μπορεί να χρησιμοποιήσει την κεφαλίδα,,en,κλήσεις,,en,Όταν προσπαθείτε να το κάνετε αυτό,,en,θα λάβετε το μήνυμα σφάλματος που λέει ότι η κεφαλίδα έχει ήδη γίνει,,en,Για αυτό το πρόβλημα,,en,Βρήκα την έξυπνη λύση σε ένα από τα πρόσθετα που χρησιμοποιώ,,en,Ξεχάσατε ποιο,,en,αλλά υποθέτω ότι είναι μια κοινή τεχνική,,en,Η λύση είναι να ορίσετε ένα κενό iFrame και να ορίσετε την πηγή του σε αυτό που θα γράψει η συνάρτηση PHP,,en,Δεδομένου ότι το iFrame αναμένει μια πλήρη πηγή HTML,,en,σου επιτρέπεται,,en,υποχρεωμένος,,en,για να δώσετε την κεφαλίδα,,en,οδηγίες,,en,Το απόσπασμα κώδικα μοιάζει με,,en,Τώρα το ερώτημα είναι,,en,ποια πρέπει να είναι η πηγή,,en,τι είναι $ styleurl,,en,δεν πρόκειται να είναι στατικό αρχείο στον διακομιστή σας,,en. But our trouble is that we are working in the WordPress plugin framework, and cannot use the header() calls. When you try to do that, you will get the error message saying that header is already done dude. For this problem, I found the ingenious solution in one of the plugins that I use. Forgot which one, but I guess it is a common technique. The solution is to define an empty iFrame and set its source to what the PHP function would write. Since iFrame expects a full HTML source, you are allowed (in fact, obliged) to give the header() directives. The code snippet looks something like:

<iframe id="saveCSS" src="about:blank" style="visibility:hidden;border:none;height:1em;width:1px;"></iframe>
<script type="text/javascript">
var fram = document.getElementById("saveCSS");
<?php echo 'fram.src = "' . $styleurl .'"' ;
?>

Now the question is, what should the source be? In other words, what is $styleurl? Clearly, it is not going to be a static file on your server. Και ο σκοπός αυτής της ανάρτησης είναι να δείξει ότι δεν χρειάζεται να είναι καθόλου αρχείο στον διακομιστή,,en,Είναι μια απάντηση δύο μερών,,en,Πρέπει να θυμάστε ότι εργάζεστε στο πλαίσιο του WordPress,,en,και δεν μπορείτε να δημιουργήσετε αυτόνομα αρχεία php,,en,Το μόνο πράγμα που μπορείτε να κάνετε είναι να προσθέσετε επιχειρήματα στα υπάρχοντα αρχεία php,,en,ή τα πρόσθετα που έχετε δημιουργήσει,,en,Γι 'αυτό πρώτα κάνετε ένα κουμπί υποβολής ως εξής,,en,Σημειώστε ότι το χαρακτηριστικό ονόματος του κουμπιού είναι,,en,saveCSS.,,en,στο τμήμα του κώδικα που χειρίζεται υποβάλλει,,en,κάνεις κάτι σαν,,en,Αυτό είναι το $ styleurl που θα δώσατε ως πηγή του iFrame,,en,προς τα εμπρός,,sv,Λάβετε υπόψη ότι είναι το ίδιο με το URL της σελίδας σύνδεσης,,en,εκτός από το ότι καταφέρατε να προσθέσετε,,en,σώσει,,en,στο τέλος του,,en,Το επόμενο τέχνασμα είναι να συλλάβει αυτό το επιχείρημα και να το χειριστεί,,en,Γι'αυτό,,en. It is a two-part answer. You have to remember that you are working within the WordPress framework, and you cannot make standalone php files. The only thing you can do is to add arguments to the existing php files, or the plugins you have created. So you first make a submit button as follows:

<form method="post" action="<?php echo $_SERVER["REQUEST_URI"]?>">
<div class="submit">
<input type="submit" name="saveCSS" title="Download the tweaked stylesheet to your computer" value="Download Stylesheet" />
</div>

Note that the name attribute of the button is “saveCSS.” Now, in the part of the code that handles submits, you do something like:

<?php
if (isset($_POST['saveCSS']))
$styleurl = get_option('siteurl') . '/' . "/wp-admin/themes.php?page=theme-tweaker.php&save" ;

?>

This is the $styleurl that you would give as the source of your iFrame, fram. Note that it is the same as your pluging page URL, except that you managed to add “?save” at the end of it. The next trick is to capture that argument and handle it. For that, χρησιμοποιείτε τη λειτουργία API του WordPress,,en,add_action ως,,en,Αυτό προσθέτει μια συνάρτηση saveCSS στο αρχικό μέρος της προσθήκης σας,,en,Τώρα πρέπει να ορίσετε αυτήν τη λειτουργία,,en,Τώρα είμαστε σχεδόν ελεύθεροι στο σπίτι,,en,Το μόνο πράγμα που πρέπει να καταλάβετε είναι ότι εσείς,,en,κάνω,,en,χρειάζομαι τον κύβο,,en,Εάν η λειτουργία σας δεν πεθαίνει,,en,θα εκτοξεύσει τα υπόλοιπα πράγματα που δημιουργούνται από το WordPress στο αρχείο αποθήκευσής σας,,en,προσαρτώντας το στη συμβολοσειρά σας $ stylestr,,en,Μπορεί να φαίνεται περίπλοκο,,en,Υποθέτω ότι είναι λίγο περίπλοκο,,en,αλλά μόλις το εφαρμόσετε και το ξεκινήσετε,,en,μπορείς,,en,και κάνω,,en,Ξέχνα το,,en,Γι 'αυτό το δημοσίευσα εδώ,,en,έτσι ώστε την επόμενη φορά που πρέπει να το κάνω,,en,Μπορώ να το αναζητήσω,,en,php,,en,προσθήκες,,en,σειρά,,en,wordpress,,en,Το δώρο του Humboldt από τον Saul Bellow,,en, add_action as:

<?php
if (isset($_GET['save'] ))
add_action('init', array(&$thmTwk, 'saveCSS'));
else
remove_action('init', array(&$thmTwk, 'saveCSS'));
?>

This adds a function saveCSS to the init part of your plugin. Now you have to define this function:

<?php
function saveCSS() {
header('Content-Disposition: attachment; filename="style.css"');
header("Content-Transfer-Encoding: ascii");
header('Expires: 0');
header('Pragma: no-cache');
$stylestr = "Whatever string you want to save";
ob_start() ;
print $stylestr ;
ob_end_flush() ;
die() ;
}
?>

Now we are almost home free. The only thing to understand is that you do need the die(). If your function doesn’t die, it will spew out the rest of the WordPress generated stuff into your save file, appending it to your string $stylestr.

It may look complicated. Well, I guess it is a bit complicated, but once you implement it and get it running, you can (and do) forget about it. At least, I do. That’s why I posted it here, so that the next time I need to do it, I can look it up.