PHP/Language Basics/static variables

A static variable remembering its last value

 
<?php
function birthday(  ){
    static $age = 0;
    $age = $age + 1;
    echo "Birthday number $age<br />";
}
$age = 30;
birthday(  );
birthday(  );
echo "Age: $age<br />";
?>

static variables

 
<?php
function keep_track() { 
   STATIC $count  = 0;
   $count++;
   print $count;
   print "<br>";
} 
keep_track();
keep_track();
keep_track(); 
?>

Using the static modifier to change a member or method so it is accessible without instantiating the class

 
<?php 
class myclass { 
    const MYCONST = 123; 
    
    static $value = 567; 
} 
echo "myclass::MYCONST = " . myclass::MYCONST . "\n"; 
echo "myclass::$value = " . myclass::$value . "\n"; 
?>

Working with Static Variables in Functions

 
<?php
    function statictest() {
        static $count = 0;
        $count++;
        return $count;
    }
    statictest();
    statictest();
    $foo = statictest();
    echo "The statictest() function ran $foo times.<BR>";
?>