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Detailed explanation of the comparison between static delayed binding and ordinary static efficiency in PHP

黄舟Original: 2017-10-21 09:25:571332browse

Comparison of PHP static delayed binding and ordinary static efficiency

It’s just a simple experiment, comparing the efficiency of delayed binding and non-delayed

Delayed binding mainly uses the static keyword to replace the original self, but the function is very powerful

Experimental code:

class A { 
  protected static $cc1 = array(&#39;a1&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc2 = array(&#39;a2&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc3 = array(&#39;a3&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc4 = array(&#39;a4&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc5 = array(&#39;a5&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
 
  public static function n1() { 
    return static::$cc1; 
  } 
  public static function n2() { 
    return static::$cc2; 
  } 
  public static function n3() { 
    return static::$cc3; 
  } 
  public static function n4() { 
    return static::$cc4; 
  } 
  public static function n5() { 
    return static::$cc5; 
  } 
} 
 
class C extends A { 
 
} 
 
class B { 
  protected static $cc1 = array(&#39;a1&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc2 = array(&#39;a2&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc3 = array(&#39;a3&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc4 = array(&#39;a4&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
  protected static $cc5 = array(&#39;a5&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;); 
 
  public static function n1() { 
    return self::$cc1; 
  } 
  public static function n2() { 
    return self::$cc2; 
  } 
  public static function n3() { 
    return self::$cc3; 
  } 
  public static function n4() { 
    return self::$cc4; 
  } 
  public static function n5() { 
    return self::$cc5; 
  } 
}

There are three classes A, B, and C above, all of which are static member variables and methods. Among them,

A class uses static delay,
B class is non-delay,
Class C inherits class A and implements delayed binding of static member variables and methods.

I won’t go into details about the process. The environment is PHP5.4.27. Directly upload the test results:

There are two situations,

1. When there are only A and B class (that is, no class is allowed to inherit class A), there is almost no difference in efficiency

2. When class A is inherited by class C, the performance of class A using static delayed binding It will be slightly worse than class B (as long as class A has inherited classes, it will be slower)

Loops 100,000 times, and the time difference between 2.8s ~ 3.2s is about 0.3 seconds. It should be negligible

Addition:Later, some test methods were added. If class C inherits class A and overloads some of the static member variables in class A, reload The more loads, the closer the speed will be to Class B (non-delayed), but the speed of Class A will still be slower than Class B and Class C

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Detailed explanation of the comparison between static delayed binding and ordinary static efficiency in PHP

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