Category Archives: PHP

PHP: Static functions in a Class

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Static functions can be used without instantiating the object.

A quick example of a static function is shown below as well as a comparison with a non static function.

A quick example of this (in PHP5):

class TestClass{
	static function staticFunction(){
		echo "static function called";
	}
 
	function nonStaticFunction(){
		echo "nonstatic function was called";
	}
}
 
TestClass::staticFunction(); //will echo static function called
 
$testClass = new TestClass();
$testClass.nonStaticFunction(); //will echo nonstatic function was called
unset($testClass);

PHP: converting a uuid stored as BINARY(16) in mysql to RFC 4122 format

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If you are storing uuid’s are BINARY(16) in the database, then the following will turn the stored id to the “original” format.

$uuidReadable = unpack("h*",$uuid);
$uuidReadable = preg_replace("/([0-9a-f]{8})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{12})/", "$1-$2-$3-$4-$5", $uuidReadable);
$uuidReadable = array_merge($uuidReadable);
echo "uuid is " . $uuidReadable[0];

PHP5: Quick on timing a script

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Sometimes it is nice to know how long a scrip took to execute (or a part of a script).
This is a simple way to time a script in php.

$time_start = microtime(true);
 
usleep(500);
 
$time_end = microtime(true);
$time = $time_end - $time_start;
 
echo "run time was " . $time . " seconds";

SimpleXML tags with – in the name

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Sometimes a xml file will have tags with “-“s in the name.
It is not to hard to parse this using simplexml, just use the tagname inside curly brackets like: “{tag-name}”

<?xml version="1.0" encoding="utf-8"?>
<medprod xmlns:npl="urn:schemas-instance" version="129">
  <statuses>
    <mpa_status xmlns:mpa="urn:schemas-mpa" datastatus="valid" procstatus="reviewed"/>
  </statuses>
  <mpa_pharmaceutical-form-group-lx xmlns:mpa="urn:schemas-mpa" v="OSD"/>
</medprod>

Let’s assume we load the above in a SimpleXML object called $simplemedprodXml

$simplemedprodXml= simplexml_load_string($xmlString);
echo (string)$simplemedprodXml['version'];
echo (string)$simplemedprodXml->statuses->mpa_status['datastatus'];
echo (string)$simplemedprodXml->statuses->mpa_status['procstatus'];
echo (string)$simplemedprodXml->{'mpa_pharmaceutical-form-group-lx'}['v'];

PHP: casting stdClass Object to a array

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When using Soapclient to access a webservice the returned object will be of a stdClass Object.

If you don’t wish to access this as an object, but would find it easier to use it as an array then a quick cast solves this.

/*As an object*/
print_r($soapResult->contents);
/*cast to an array*/
$soapResult = (array)$soapResult;
print_r($soapResult['contents']);

PHP5: Quick on exceptions

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Very quick (&dirty):

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try{
	doStuff();
}
catch (Exception $e){
	echo 'Error on line '. $e->getLine().' in '. $e->getFile() . $e->getMessage();
	//Or if you are working inside an object, you could use.
	echo 'Error on line '.$this->getLine().' in '.$this->getFile() . $e->getMessage();
}

Now to catch a specific kind of exception (in this case CustomException), and say woups, but to re-throw all other Exceptions.

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try{
	doStuffThatCanGiveCustomException();
}
catch (Exception $e){
	//echo get_class($e) . "<br/>";
	if (get_class($e) == "CustomException" && $e->getMessage() === "My custom exception message."){
		echo "woups";
	}
	else
		throw $e;
}

To throw a custom exception:

 throw new Exception('My exception message');

For more informaion about this please check out the php manual