PHP Static

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In PHP language, the static keyword is mainly used for memory management. The static variable is shared by all the objects of that class. It is visible only within the class, but its lifetime is the entire program.

The static keyword can be used:

  • Static Variable
  • Static Method

Static Variable

To declare a variable as static is called as static variable.

Syntax:

static variable_name;

Example:

<?php
class StaticVariable {
    public static $a = 5;

    public static function main() {
        echo "Area of the square: " . (self::$a * self::$a) . "\n";
    }
}

// Call the main method
StaticVariable::main();
?>
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Static Method

Method of a class can also be declared as static. But the static method can access only static data member.

Syntax:

 static method_name()
{
	...
}

Example:

<?php
class StaticMethod {
    public static $a = 6;

    public static function square() {
        self::$a = 5;
    }

    public static function main() {
        self::square(); // Calling the static method
        echo "Area of the square: " . (self::$a * self::$a) . "\n";
    }
}

// Call the main method
StaticMethod::main();
?>
Run ›
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