PHP - Class Static properties and methods

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Introduction

PHP can define properties and methods linked to the class itself rather than to the object.

These properties and methods are defined with the keyword static. 

class My{
     private static $lastId = 0; 

     public static function getLastId(): int { 
        return self::$lastId; 
     } 
}

You can reference it either using the class name or an existing instance, from anywhere in the code:

Demo

<?php
class My{/*w w w .j a v  a 2  s . com*/
     private static $lastId = 0; 

     public static function getLastId(): int { 
        return self::$lastId; 
     } 
}
     
$myInstance = new My();
print(My::getLastId()); 
echo '\n';
print($myInstance::getLastId()); 
?>

Result

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