Unified conditional arguments and replaced APC example

_posts/03-05-01-Command-Line-Interface.md

@@ -22,7 +22,7 @@ Let's write a simple "Hello, $name" CLI program. To try it out, create a file na
 
 {% highlight php %}
 <?php
-if($argc != 2) {
+if ($argc != 2) {
     echo "Usage: php hello.php [name].\n";
     exit(1);
 }

_posts/05-03-01-Date-and-Time.md

@@ -16,7 +16,7 @@ output.
 $raw = '22. 11. 1968';
 $start = \DateTime::createFromFormat('d. m. Y', $raw);
 
-echo "Start date: " . $start->format('m/d/Y') . "\n";
+echo 'Start date: ' . $start->format('m/d/Y') . "\n";
 {% endhighlight %}
 
 Calculating with DateTime is possible with the DateInterval class. DateTime has methods like `add()` and `sub()` that
@@ -30,29 +30,28 @@ $end = clone $start;
 $end->add(new \DateInterval('P1M6D'));
 
 $diff = $end->diff($start);
-echo "Difference: " . $diff->format('%m month, %d days (total: %a days)') . "\n";
+echo 'Difference: ' . $diff->format('%m month, %d days (total: %a days)') . "\n";
 // Difference: 1 month, 6 days (total: 37 days)
 {% endhighlight %}
 
 On DateTime objects you can use standard comparison:
 {% highlight php %}
 <?php
-if($start < $end) {
+if ($start < $end) {
     echo "Start is before end!\n";
 }
 {% endhighlight %}
-    
+
 One last example to demonstrate the DatePeriod class. It is used to iterate over recurring events. It can take two
 DateTime objects, start and end, and the interval for which it will return all events in between.
 {% highlight php %}
 <?php
 // output all thursdays between $start and $end
 $periodInterval = \DateInterval::createFromDateString('first thursday');
 $periodIterator = new \DatePeriod($start, $periodInterval, $end, \DatePeriod::EXCLUDE_START_DATE);
-foreach($periodIterator as $date)
-{
+foreach ($periodIterator as $date) {
     // output each date in the period
-    echo $date->format('m/d/Y') . " ";
+    echo $date->format('m/d/Y') . ' ';
 }
 {% endhighlight %}
 

_posts/10-03-01-Object-Caching.md

@@ -28,15 +28,12 @@ Example logic using APC:
 {% highlight php %}
 <?php
 // check if there is data saved as 'expensive_data' in cache
-$data = apc_fetch('expensive_data');
-if (!$data)
-{
-    // data not in cache, do expensive call and save for later use
-    $data = get_expensive_data();
-    apc_store('expensive_data', $data);
+if (apc_fetch('expensive_data') === false) {
+    // data is not in cache; save expensive call for later use
+    apc_add('expensive_data', get_expensive_data());
 }
 
-print_r($data);
+print_r(apc_fetch('expensive_data'));
 {% endhighlight %}
 
 Learn more about popular object caching systems: