WordPress developer links

If you have lot’s of comment’s that are constantly refreshing the cache,
you might also consider using comment services like Facebook / Intense Debate / Disqus / LiveFyre

Use WordPress cache plugins, many good out there.

Test your site with online performance services:

Here is one:

http://www.webpagetest.org/

New Relic:

http://newrelic.com/

View the log files:

Check all log files you have (php, apache, nginx, mysql, …)

If you have ssh access:

Also consider using `Nginx` instead of `Apache`

You should also check what process is using your resources via ps/top/htop/… (i.e. is it apache or mysql or something else) if you have access to a Linux console

If it’s mysql there is a great script called tuning-primer.sh that can give you hints how to configure it (if you have access to ssh, you can check it with top or htop)

Use APC cache for php

(this article is a work in progress)

Countdown between two unix timestamps

Posted on November 16, 2012 by Birgir — No Comments ↓

Here is a way to display the day/hour/min difference between two unix timestamps, fx

6 days 6 hours 37 minutes

Here is the above example

<?php 
$future_time=1353628800; 
$current_time=time(); 
echo countdown($current_time,$future_time); 
?>

and here is the function where you can translate/change the labels:

<?php 
/**  
* Calculates the number of days, hours and minutes 
* between two Unix timestamps.  
*  
* The Unix timestamp $t2 should be greater than $t1  
*  
* @param integer $t1 Date with Unix timestamp format.  
* @param integer $t2 Date with Unix timestamp format.  
* @return string Formatted string 
* fx: 3 days 5 hours 23 minutes  
*/ 
function countdown($t1,$t2){         
        // t2 > t1

        // setup
        $out ="";
        $days_label=" days ";
        $day_label=" day ";
        $hours_label=" hours ";
        $hour_label=" hour ";
        $mins_label=" minutes ";
        $min_label=" minute "i
        $timeup_label=" ho ho - the time is up";

        // calculate
        $diff=$t2-$t1;
        $d=$diff/86400;
        $days=(int)$d;
        $h=($d-$days)*24;
        $hours=(int)$h;
        $m=($h-$hours)*60;
        $mins=(int)$m;

        // find out the labels (singular/plural)
        $d_label=($days==1)?$day_label:$days_label;
        $h_label=($hours==1)?$hour_label:$hours_label;
        $m_label=($mins==1)?$min_label:$mins_label;

        // output
        if($days>0){
                $out.= $days.$d_label;
        }
        if($hours>0){
                $out.= $hours.$h_label;
        }
        if($mins>0){
                $out.= $mins.$m_label;
        }
        if($days+$hous+$mins <= 0 ){
                $out=$timeup_label;
        }

        return $out;
}
?>

Pizza order time – content with weekly opening hours

Posted on October 18, 2012 by Birgir — 2 Comments ↓

This wordpress.org forum thread:

http://wordpress.org/support/topic/how-to-close-pizza-order-site-or-page-outside-business-hours

gave me an idea of a shortcode that can display content during given opening hours in the week and can handle shortcodes inside it.

Maybe this will grow into a plugin in the near future

The shortcode is

[openinghours] ... some content only available during opening hours ... [/openinghours]

and here is an example of the supported (optional) attributes:

sun="11:00-22:30" // the opening hours every sunday
mon="09:00-23:00" 
tue="09:00-15:00" 
wed="09:00-23:00" 
thu="10:15-14:59" 
fri="09:00-23:00" 
sat="09:00-24:00" 
debug="0" // debug="1" will display debug information
sorry="Sorry, we are closed now. Try again during the opening hours." // text to display when it's closed
holidays="2012-07-04,2012-12-24"  // YYYY-MM-DD, YYYY-MM-DD,...

Here is a full working example (closed every sunday and saturday and open from 09-17 mon-fri. Holidays are 2012-07-04 and 2012-12-24):

[openinghours mon="09:00-17:00" tue="09:00-17:00" wed="09:00-17:00" thu="09:00-17:00" fri="09:00-17:00"  debug="0" holidays="2012-07-04,2012-12-24" sorry="Sorry, we are closed now. Try again during the opening hours."] please order now! [foobar]
[/openinghours]

Here is the code to paste into the functions.php file:

//
// shortcode to display content only on given weekly opening hours
// usage: [openinghours][/openinghours]
// author: Birgir E.
// url: http://xlino.com
// created: 2012-10-18
// version: 1.1
//
function my_openinghours($atts,$content=""){
        extract( shortcode_atts( array(
                'sun' => '', // the opening hours every sunday
                'mon' => '', // the opening hours every monday
                'tue' => '', 
                'wed' => '',
                'thu' => '',
                'fri' => '',
                'sat' => '',
                'sorry' => '', // text to display when it's closed
                'debug' => '0', // debug="1" will display debug information
                'holidays' => '', // fx: holidays="2012-07-04,2012-12-24", the format is YYYY-MM-DD, YYYY-MM-DD,...
        ), $atts ) );

        // current time
        $currT=time();
        $currYMD=date("Y-m-d",$currT);
        $currYMDHIS=date("Y-m-d H:i:s",$currT);
        $currWD=date("w",$currT);

        // get the opening hours for today
        switch ($currWD){
                case 0:
                        $s=$sun;
                        break;
                case 1:
                        $s=$mon;
                        break;
                case 2:
                        $s=$tue;
                        break;
                case 3:
                        $s=$wed;
                        break;
                case 4:
                        $s=$thu;
                        break;
                case 5:
                        $s=$fri;
                        break;
                case 6:
                        $s=$sat;
                        break;
                default:
                        $s="";
        }

        // format input
        $out=esc_attr($sorry);
        $holidays=esc_attr($holidays);
        $s=esc_attr(trim($s));
        $debug=(int)$debug;
 
        // do the time checks
        if(strlen($s)>0){
                $a=explode("-",$s);
                if(count($a)==2){
                        $from = $currYMD." ".$a[0].":00";
                        $to = $currYMD." ".$a[1].":00";
                        $fromT = strtotime($from);
                        $toT = strtotime($to);
                        if($currT>$fromT && $currT<$toT && strpos($holidays,$currYMD)===false){
                                $out=do_shortcode($content);
                        }
                }
        }
        // check if we have debug mode on
        if($debug=="1"){
                $out.="<div style='background-color:#ccc;padding:10px;border:1px solid #333;margin:10px;'>Debug: <br/>";
                $out.="from:".$from."<br/> current:".$currYMDHIS."<br/> to:".$to."</div>";
        }
        return $out;
}

add_shortcode("openinghours","my_openinghours");

bon appetit

changelog:

version 1.1
added holidays

version 1.0
inital version (Props: @lemonadejoex, @keesiemeijer)

Facebook Debug Links – wordpress plugin

Posted on July 22, 2012 by Birgir — 1 Comment ↓

Download the plugin here:
http://wordpress.org/extend/plugins/facebook-debug-links/

This plugin adds a link in the row-action section to view the page/post in the Facebook Debugger:

This plugin adds a metabox on the post/page screen:

Only published posts/pages will get Facebook Debug links.

YouList – Youtube playlist shortcode – wordpress plugin

Posted on July 21, 2012 by Birgir — 15 Comments ↓

Download the plugin here:
http://wordpress.org/extend/plugins/youlist/

Support Open Source developement:

The plugin supports both single and multi site WordPress installs.

Reviews:

Review on wpmu.org:
http://wpmu.org/wordpress-youtube-player/
Check out the review on wppluginsatoz.com (these guys are doing some great WordPress podcasts )

How to use this plugin?
When you have installed it, you can for example start by pasting this shortcode into your WordPress post editor:

[youlist pid="PL3FF15AA7ED356D9F"]

like this: