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Results: 1578

Notes

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abstract class can contain both methods with definitions and abstract methods

abstract class Fruit { 
    private $color; 
    
    abstract public function eat(); 
    
    public function setColor($c) { 
        $this->color = $c; 
    } 
} 

class Apple extends Fruit {
    public function eat() {
        echo "Omnomnom";
    }
}

$obj = new Apple();
$obj->eat();

In this example an

interface

would not be able to have method with definition, only method signatures are allowed in interfaces

by Valeri Tandilashvili

PHP

OOP

Guitar implements IMusician interface

interface IMusician {
    public function play();
}

class Guitarist implements IMusician {
    public function play() { 
        echo "playin a guitar";
    }
}

In this example

Guitarist

child class has to define

play()

method because the child class implements interface

IMusician

that has the method signature

by Valeri Tandilashvili

PHP

OOP

An interface can extend other interfaces CODE

An interface can extend another interface in the same way that a class can extend another class

Interface IBar {
    public function method3();
}

Interface IArray {
    public function method2();
}

Interface IFoo extends IBar, IArray {
    public function method1();
}

class class1 implements IFoo {
    public function method1() {
        
    }
    public function method2() {
        
    }
    // public function method3() {
        
    // }
}

Class

class1

implements

IFoo

interface which extends other two interfaces itself. Because the class has not implemented

method3

method (commented), then the following error will be generated:

Fatal error:  Class class1 contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (IBar::method3)

by Valeri Tandilashvili

PHP

OOP

preconnect to required origins

Problem: Consider adding

preconnect

dns-prefetch

resource hints to establish early connections to important third-party origins. For example to pre-connect google analytics:

https://www.google-analytics.com

we should include

rel

attribute with

preconnect

value:

<link rel="preconnect" href="https://www.google-analytics.com" crossorigin>

head

tag

by Valeri Tandilashvili

HTML

lighthouse

Form elements do not have associated labels

Solution to the problem was to add labels for the inputs but hidden by

CSS

/* Fix to pass Lighthouse: */
.label-hidden {
    position: absolute;
    height: 1px;
    width: 1px;
    clip: rect(1px,1px,1px,1px);
    border: 0;
    overflow: hidden
}

Another solution to the problem:

/* Fix to pass Lighthouse: */
label-hidden { 
    position: absolute; 
    top:-1000px; 
    left:-1000px; 
}

by Valeri Tandilashvili

HTML

lighthouse

Links do not have a discernible name

Solution to the problem - to use

aria-label="Twitter"

attribute on

tag

<a href="<?=$hostname?>" aria-label="Sibrdzne" class="bg-logo"></a>

by Valeri Tandilashvili

HTML

lighthouse

jQuery vulnerabilities

Older version of jQuery library has XSS vulnerabilities (lighthouse) Because of that

jquery-1.7.2.min.js

was replaced by

jquery-3.5.1.min.js

by Valeri Tandilashvili

jQuery

lighthouse

noreferrer on links

Links to cross-origin destinations were not safe (

lighthouse

) Advice: Add

rel="noopener"

rel="noreferrer"

to any external links to improve performance and prevent security vulnerabilities

<a class="a_" rel="noreferrer" href="http://orthodoxy.ge" target="_blank" title="მართლმადიდებლური საიტი orthodoxy.ge">orthodoxy.ge</a>

Links that the

noreferrer

was used:

orthodoxy.ge

teodore.ge

qadageba.ge

by Valeri Tandilashvili

HTML

lighthouse

getallheaders

Fetches all HTTP headers from the current request

print_r(json_encode(getallheaders()));

The result of the above code is:

{
    "Content-Type": "application/json",
    "User-Agent": "PostmanRuntime/7.26.8",
    "Accept": "*/*",
    "Postman-Token": "a89b677d-776a-45d7-988c-f18ad2512522",
    "Host": "localhost",
    "Accept-Encoding": "gzip, deflate, br",
    "Connection": "keep-alive",
    "Content-Length": "137"
}

by Valeri Tandilashvili

PHP

functions

calculate age based on the provided date of birth

function age($dob) {
    // Seconds in a year
    $seconds = 31556926;

    // Calc. age based on the provided date_of_birth val
    $age = floor((time() - strtotime($dob)) / $seconds);

    return $age;
}

by Valeri Tandilashvili

PHP

Results: 1578