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Test Number : C2160-667
Test Name : IBM Test667- Architectural Design of SOA Solutions
Vendor Name : IBM
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IBM Architectural Dumps
Key Takeaways
php 7 became the lots awaited personal home page.subsequent after Hypertext Preprocessor 5. personal home page 7.4 is the final minor edition unencumber of php 7.
besides featuring a couple of new aspects, personal home page 7.x is quicker and cloud-ready.
Hypertext Preprocessor 7.2 brought partial aid for Contravariance and Covariance, and personal home page 7.four delivered full aid for the same.
Hypertext Preprocessor 7.2 added a brand new type called object.
Hypertext Preprocessor is still one of the most conventional languages on the net. personal home page is used by way of seventy eight.6% of internet sites whose server-facet programming language is well-known.
php 7.x brings a couple of advancements and new elements that touch all aspects of the language, together with superior support for object oriented programming, extensions to classes and interfaces, improvements to the category gadget, error dealing with, and greater. in this series of articles, we focus on new elements throughout the a considerable number of php 7.x models.
personal home page had develop into virtually a forgotten language with a lapse of more than 10 years without a brand new fundamental version after personal home page 5.0 in 2004. To make issues worse, personal home page 6.x was abandoned as a result of a planned addition of native Unicode aid to personal home page that couldn't be applied.
php 7.0 is an enormous version with a number of advancements and new elements delivered. one of the most salient new features in 7.0 are scalar type declarations for strings, integers, floating-factor numbers and booleans; return category declarations; a brand new feature referred to as outline() for array constants; and anonymous courses. Some elements have been added to increase unicode support including the IntlChar class and the unicode codepoint break out syntax.
moreover, expectations had been brought to enhance the assert() feature, while generator return functions and generator delegation Excellerate generator performance. Subsequent minor types, together with Hypertext Preprocessor 7.1 through php 7.four, delivered other new features.
in this sequence of articles, we will focus on new aspects within the quite a few php 7.x versions. but first, let’s discuss why php 7.
Why use php 7?
in short, personal home page 7 brings personal home page to the level of different contemporary languages.
one of the salient explanations to use Hypertext Preprocessor 7 are as follows:
1. WordPress is used via 36.four% of all sites. personal home page 7 is the legit informed php edition for WordPress.
"When updating to a new edition of php, WordPress encourages updating to its informed edition, Hypertext Preprocessor 7.three. The php internals crew has executed a fine job making its most accurate edition the fastest version of php yet. This capacity that updating will enrich the pace of your web page, both for you and your visitors."
2. Hypertext Preprocessor 7 offers a number of new elements as outlined before.
3. Hypertext Preprocessor 7 is in keeping with a new Zend Engine with more suitable efficiency and pace. Zend is very fast, as found in a few velocity benchmark assessments run with diverse systems/configurations.
four. Hypertext Preprocessor 7 makes use of effective records buildings making it leaner in comparison to earlier models.
5. php 7 is Cloud-equipped with most important cloud service suppliers assisting it of their LAMP Stack.
setting the atmosphere
To be in a position to look at various or run the pattern scripts presented here, down load and deploy the latest personal home page 7 version (Hypertext Preprocessor 7.four). The binaries to down load and the steps to install them vary with the platform used, so consult with the legit php medical doctors for counsel. do not forget to add the installation root listing, e.g., C:\PHP7.4\personal home page-7.4-ts-home windows-vc15-x64-r6c9821a, to your course ambiance. Rename Hypertext Preprocessor.ini-production or php.ini-building to personal home page.ini. to make use of the extensions within the /ext directory set the extension_dir directive in Hypertext Preprocessor.ini:
extension_dir = "./ext"
beginning the built-in server with here command:
php -S localhost:8000
Add all scripts to be run within the scripts sub-directory of the root listing, which is the install directory, e.g., C:\PHP7\php-7.3.0-Win32-VC15-x64. the basis listing may well be set to a distinct cost the use of the doc_root directive in php.ini. To make the personal home page scripts used as examples reusable, keep them separately in place of testing/working every script as look at various.personal home page.
Covariance and Contravariance
personal home page 7.2 added restricted covariance and contravariance. Covariance refers to a subclass’s formulation to be in a position to return a more particular return category. Contravariance refers to a subclass’s formulation to accept a less certain parameter classification. more/less specific is defined within the context of tremendous/subclass, with a subclass being extra selected. a class extending a further type may also override its methods whereas still preserving contravariance (for parameter varieties) and covariance (for return type).
guide for covariance and contravariance is restricted in php 7.2, which suggests that only variance to no class is supported. To difficult, a return class can be described in an overriding characteristic where none existed within the tremendous type, and a parameter classification could be left out when overriding a function the place a parameter existed within the tremendous category.
for instance, create a script and declare a class A with a single feature, fn1. Create an additional class B that extends classification A and overrides its fn1 feature.
The parameter category in the overridden characteristic fn1 is overlooked, which defaults to mixed, a parameter class widening from classification B in classification A. the availability to pass over parameter type/s in overridden strategies, whether category is summary or no longer, is yet another new characteristic in Hypertext Preprocessor 7.
The return classification in the overridden characteristic fn1 is A, which is a narrowing from the blended category in type A. The script is listed right here:
<?php
type A
feature fn1(B $b)
category B extends A
characteristic fn1($b): A
New object type
Hypertext Preprocessor 7.2 has introduced help for a brand new category called object that can be used as a parameter type and return class. circumstances of all classification types are objects. To show using an object as a parameter classification and return type, create a script object.personal home page in a listing known as scripts in the document root and declare two courses, ClassA and classB, with each and every class defining a hiya() function that echoes a string message. next, add a hello() characteristic to the script itself with each parameter classification and return category as object. The hiya() function added at once in the script returns an illustration of category ClassB:
characteristic hey(object $obj) : object
return new ClassB();
Invoke the feature with an instance of ClassA as argument and invoke the howdy() feature on the item back.
good day(new ClassA())->hi there();
the item.php is listed:
<?php
classification ClassA
feature howdy()
echo "hello from ClassA";
classification ClassB
function howdy()
echo "hiya from ClassB";
function hi there(object $obj) : object
return new ClassB();
howdy(new ClassA())->hello();
?>
running the script with url http://localhost:8000/scripts/object.php will output:
hello from ClassB
As here is the primary example script we have run, the output within the browser is shown in figure 1.
figure 1. Output from object.php
the article category itself does not signify a class; it is just a kind. a brand new instance of the developed-in class stdClass is created if any class aside from object is transformed to object.
An array can also be converted to an object by casting it to the object class, with the ensuing object having homes named like the array keys. To show a way to convert an array to an object, and several helpful connected projects, create an object_array.personal home page script and declare an object through casting it to object.
$obj = (object) array('journal' => 'Oracle journal', 'publisher' => 'Oracle Publishing','edition' => 'January February 2018');
Now, that you could output the item houses the usage of the named keys.
echo $obj->'journal';
echo $obj->'writer';
echo $obj->'edition';
The bool isset ( combined $var [, mixed $... ] ) characteristic might also be used to discover if a property is set as follows.
var_dump(isset($obj->'journal'));
Output an object key the use of the blended key ( array $array ) characteristic.
var_dump(key($obj));
develop the internal array pointer with mixed subsequent ( array &$array ).
subsequent($obj);
Invoke the isset and key features for the next array aspect. Repeat the sequence of invoking next, isset and key features for the subsequent point. Object member variables may well be accessed to output their values.
echo $obj->journal;
echo $obj->publisher;
echo $obj->edition;
find if the transformed object from the array is an instance of stdClass.
if($obj instanceof stdClass)
echo '$obj is example of built-in category stdClass';
A string may well be converted to object through casting it to object. The value of the converted object is accessed using the member variable scalar. find if the converted object is an example of stdClass.
$obj = (object) 'hiya';
echo $obj->scalar;
if($obj instanceof stdClass)
echo '$obj is example of constructed-in type stdClass';
The object_array.php script is listed.
<?php
$obj = (object) array('journal' => 'Oracle journal', 'publisher' => 'Oracle Publishing','edition' => 'January February 2018');
echo $obj->'journal';
echo "<br/>";
echo $obj->'publisher';
echo "<br/>";
echo $obj->'edition';
echo "<br/>";
var_dump(isset($obj->'journal'));
echo "<br/>";
var_dump(key($obj));
subsequent($obj);
echo "<br/>";
var_dump(isset($obj->'writer'));
echo "<br/>";
var_dump(key($obj));
next($obj);
echo "<br/>";
var_dump(isset($obj->'edition'));
echo "<br/>";
var_dump(key($obj));
echo "<br/>";
echo $obj->journal;
echo "<br/>";
echo $obj->writer;
echo "<br/>";
echo $obj->version;
echo "<br/>";
if($obj instanceof stdClass)
echo '$obj is instance of constructed-in classification stdClass';
echo "<br/>";
$obj = (object) 'good day';
echo $obj->scalar;
echo "<br/>";
if($obj instanceof stdClass)
echo '$obj is instance of constructed-in class stdClass';
?>
working the script will output :
Oracle magazineOracle Publishing
January February 2018
bool(authentic)
string(7) "journal"
bool(actual)
string(9) "writer"
bool(authentic)
string(7) "version"
Oracle magOracle Publishing
January February 2018
$obj is illustration of built-in type stdClass
hi there
$obj is instance of constructed-in classification stdClass
that you could convert not simplest arrays and strings to objects, but values of any class, including int, flow and bool. as an instance convert an int to an object, output its scalar cost and find if the transformed object is an instance of stdClass with right here script:
<?personal home page
$obj = (object) 1;
echo $obj->scalar;
echo "<br/>";
if($obj instanceof stdClass)
echo '$obj is instance of built-in type StdClass';
?>
The output is as follows:
1
$obj is illustration of built-in classification stdClass
instances of courses are objects and not situations of stdClass, and casting them to object doesn't make them an instance of stdClass. To reveal this, create a script named object_instance_of.personal home page, then declare a category and instantiate it. here script will show you the way to find out if a class example is an example of stdClass; then the script will forged the classification illustration to object and discover if the solid object is an instance of stdClass. The object_instance_of.php script is listed.
<?php
category A
$A = new A;
echo '<br/>';
if ($A instanceof stdClass)
echo '$A is illustration of developed-in class stdClass';
else
echo '$A is not example of developed-in class stdClass';
echo '<br/>';
echo '<br/>';
$AObj = (object)$A;
if ($AObj instanceof stdClass)
echo '$AObj is instance of built-in category stdClass';
else echo '$AObj is not instance of built-in type stdClass';
echo '<br/>';
?>
The output from the script is as follows:
$A isn't illustration of built-in class stdClass
$AObj is not instance of built-in type stdClass
An instance of a named type or nameless category is already an object and casting it to object doesn't exchange its class. An empty array and the NULL cost may additionally also be transformed to an object. As mentioned, stdClass is the default php object and an instance of stdClass receives created when scalars, arrays, and NULL are solid to object. An nameless class object, an object made out of an empty array, an object made from NULL, or a class without a capabilities or variables aren't considered empty and empty() does not return proper when applied to any of them. The empty() characteristic returns authentic only if a variable or object does not exist or is FALSE.
To check all this, create a object_empty.Hypertext Preprocessor script and replica right here listing to it
<?personal home page
$obj1 = (object)(new class); // Instantiate anonymous class
$obj2 = (object)[]; // cast empty array to itemtype A
$A=new A(); // illustration of empty classvar_dump($A);
echo "<br/>";
var_dump($obj1);
echo "<br/>";
var_dump($obj2);
echo "<br/>";
echo empty ($obj1);
echo "<br/>";
$obj1=NULL;
$obj3=(object)$obj1;// NULL forged to itemvar_dump($obj3);
echo "<br/>";
echo empty ($A);
echo "<br/>";
echo empty ($obj2);
echo "<br/>";
echo empty ($obj3);
?>
The script creates each and every sort of anonymous class object: an object created from an empty array, an object produced from NULL, and a category object without a functions or variables. operating the script will generate here output.
object(A)#3 (0)
object(category@anonymous)#1 (0)
object(stdClass)#2 (0) ;
object(stdClass)#1 (0)
The object class may be used for contravariance (widening) of parameter classification and covariance (narrowing) of return category.
<?Hypertext Preprocessor
type A
public function fn(object $obj)
class B extends A
public function fn($obj) : object
Full Covariance and Contravariance
We already discussed personal home page 7.2 guide for limited covariance, which allows for including a return type to a way in a protracted classification besides the fact that children none was declared within the tremendous-classification. We also discussed help for limited contravariance, which enables leaving the type of a technique parameter unspecified in an extended category.
php 7.4 provides full help for covariance and contravariance. Full guide allows less specific parameter types and greater specific return types, which suggests that a parameter category will also be substituted with one of its supertypes and a return classification may be substituted with the aid of a subtype. recall that aid for covariance and contravariance in personal home page 7.2 become restricted to a no type. In here script ClassB extends ClassA and ClassD extends ClassC. feature fn1 in ClassD broadcasts a less certain parameter classification and a more certain return class than in ClassC.
<?Hypertext Preprocessor
classification ClassA
type ClassB extends ClassA
category ClassC
public function fn1(ClassB $b): ClassA
type ClassD extends ClassC
public feature fn1(ClassA $a): ClassB
?>
probably the most traits of full variance support are:
Full variance is supported only if auto-loading is used
Variance for object type is supported
Variance for callable type is not supported
via-reference parameters are nonetheless contravariant and via-reference return type are nonetheless covariant
Variance verification is made simplest after the closing consecutive type statement
in the next article in this sequence, we shall focus on php 7.x new aspects for classes and interfaces.
concerning the author
Deepak Vohra is a sun licensed Java Programmer and sun licensed internet part Developer. Deepak has published Java and Java EE connected technical articles in WebLogic Developer's Journal, XML Journal, ONJava, java.internet, IBM developerWorks, Java Developer’s Journal, Oracle magazine, and devx. Deepak has published 5 books on Docker and is a Docker Mentor. Deepak has also published a couple of articles on personal home page and a ebook Ruby on Rails for personal home page and Java developers.
personal home page 7.x brings a number of improvements and new aspects that touch all elements of the language, including improved support for object oriented programming, extensions to classes and interfaces, advancements to the category system, error dealing with, and extra. during this collection of articles, we talk about new elements across the a lot of personal home page 7.x versions.
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Deepak Vohra is a sun licensed Java Programmer and sun licensed internet part Developer. Deepak has published Java and Java EE connected technical articles in WebLogic Developer's Journal, XML Journal, ONJava, java.internet, IBM developerWorks, Java Developer’s Journal, Oracle magazine, and devx. Deepak has published 5 books on Docker and is a Docker Mentor. Deepak has also published a couple of articles on personal home page and a ebook Ruby on Rails for personal home page and Java developers. 
