phpPerform_dynamic_static_variable_access.php

/**
 * test some performance between this and parent
 */
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
/*
$time_start = microtime_float();
///

$time_end = microtime_float();
$time = $time_end - $time_start;
 */

class base1{
    public $a;
}
class base2{
    public static $a;
}

class sonfrombase1 extends base1{
    public function __construct($b) {
        $this->a=$b;
    }
    
    public function run(){
        for($i=0;$i<10000000;$i++){
            $this->a++;
        }
    }
}

class sonfrombase2 extends base2{
    public function __construct($b) {
        parent::$a=$b;
    }
    
    public function run(){
        for($i=0;$i<10000000;$i++){
            parent::$a++;
        }
    }
}

$son1=new sonfrombase1(0);
$time_start = microtime_float();
$son1->run();
$time_end = microtime_float();
echo 'son1: ';
echo $time_end-$time_start;
echo '<br>';
$thistime=$time_end-$time_start;

$son2=new sonfrombase2(0);
$time_start = microtime_float();
$son2->run();
$time_end = microtime_float();
echo 'son2: ';
echo $time_end-$time_start;
echo '<br>';
$parenttime=$time_end-$time_start;

if($thistime>$parenttime){
    echo "static has high performance: up to ";
    echo ($thistime-$parenttime)/$parenttime;
    echo "% time comsuming";
}
else{
    echo "local has high performance: up to ";
    echo ($parenttime-$thistime)/$thistime*100;
    echo "% time comsuming";
}