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PHP Ŭ·¡½º »ç¿ë
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//class_1.php

<?
Class Sample_Class{         --->Ŭ·¹½º ¼±¾ð
   var $sum;                       --->¸É¹ö ¼±¾ð

function Sample_Class($default_num){   --->»ý¼ºÀÚ  ÇÔ¼ö ¼±¾ð
   $this->sum=$default_num;              --->   thisÀº new ¿¬»êÀÚ¿¡ ÀÇÇØ »ý¼ºµÇ´Â °´Ã¼ ÀÚ½ÅÀ» ÀǹÌÇÑ´Ù
  }                                                 --->     ->Àº »ý¼ºµÈ °´Ã¼¸¦ ÂüÁ¶Çϱâ À§ÇØ »ç¿ëµÇ´Â Áö½Ã ¿¬»êÀÚÀÌ´Ù.

function add($num){                       --->¸É¹ö ÇÔ¼ö

   $this->sum+=$num;
  }

function minus($num){
   $this->sum-=$num;
  }
function return_value(){
   return $this->sum;
  }
}

?>


==================================

//  sample_1.php

<?
include "class_1.php";    -->include Çؼ­ class_1.php ºÒ·¯¿Â´Ù

$sample=new sample_class(100);   -->new ¿¬»êÀÚ¸¦ ÀÌ¿ëÇÏ¿© Ŭ·¡½º sample_class °´Ã¼¸¦ »ý¼ºÇÏ°í ±×°ªÀ» $sampleÀ̶ó´Â

                                                       º¯¼ö·Î¹Þ¾Ò´Ù ±×¸®°í Àμö 100¸¦ ³Ñ°ÜÁÖ¾î »ý¼ºÀÚ ÇÔ¼ö¸¦ ÅëÇØ ¸É¹öº¯¼ö $this->sumÀÇ

                                                       °ªÀ» 100À¸·Î ÃʱâÈ­ ÇÏ¿´´Ù.

$sample->Add(40);                       -->add ÇÔ¼öÀ» È£ÃâÇؼ­  ÀÎÀÚ¸¦ 40¸¦ ³Ñ°ÜÁØ´Ù
$add_sum=$sample->return_value();  --> return_valueÇÔ¼ö¸¦ È£ÃâÇÏ¿© °á°ú°ªÀ» ¹Þ¾Æ add_sumº¯¼ö¿¡ °ªÀ» ÁØ´Ù.
echo "<h1>100¿¡ 40À» ´õÇÑ °ªÀº ".$add_sum."ÀÔ´Ï´Ù.<h1><br>";
$sample->minus(50);
$minus_sum=$sample->return_value();
echo"<h1> ".$add_sum." ¿¡¼­ 50À» »« °ªÀº ".$minus_sum." ÀÔ´Ï´Ù<h1>";
?>
===================================

Ŭ·¡½º »ó¼ÓÀ̶õ : class_1¿¡¼­ ¼±ÇÑ ºÎ¸ð Ŭ·¡½ºÀÎ sample_classÀÇ ±â´ÉÀ» sample_2°ú °°ÀÌ ÀÚ½Ä Å¬·¡½ºÀÎ sub_class¿¡¼­ ¹°·Á¹Þ¾Æ ±×´ë·Î »ç¿ë °¡´ÉÇϵµ·Ï Çϴ°ÍÀÌ´Ù. Áï sample_class¿¡¼­ ¼±¾ðµÈ ¸É¹öº¯¼ö³ª ¸É¹öÇÔ¼ö°¡ ÀÚ½Ä Å¬·¡½ºÀÎ sub_classÀÇ ¸É¹ö°¡ µÇ¾î ÀÚ½Ä Å¬·¡½º¿¡¼­µµ »ç¿ëÇÒ¼ö ÀÖ´Ù.

sample_2Àº class_1¿¡¼­ ÀÛ¼ºÇÑ Å¬·¡½ºÀÎ sample_class¸¦ »ó¼Ó ¹Þ¾Æ ´Ù¸¥ Ŭ·¡½ºÀÎ sub_class¸¦ »ý¼º½ÃŲ °ÍÀÌ´Ù.

// sample_2.php

<?
include "class_1.php";    // ºÎ¸ðŬ·¡½ºsample_class ¸¦ ºÒ·¯¿Â´Ù

class sub_class extends sample_class{  --> extends °¡ ¹Ù·Î Ŭ·¡½º¸¦ »ó¼Ó ¹Þ±â À§ÇÑ ¼±¾ðÀÚÀÌ´Ù.
      var $double=2;

function sub_class($default_num){    --> ÀÚ½Ä »ý¼ºÀÚ ÇÔ¼ö°¡ ºÎ¸ð »ý¼ºÀÚ ÇÔ¼öÀÇ Àμö(this->sum)¸¦ ÃʱâÈ­ ½ÃŲ´Ù.
        $this->sample_class($default_num);
      }
    function double(){  -->ºÎ¸ð Ŭ·¡½º¿¡¼­ ¸É¹öÇÔ¼ö sum¸¦ »ó¼Ó¹Þ¾Æ ó¸®ÇÑ´Ù
      $this->sum*=$this->double;
     }
    function division(){
     $this->sum/=$this->double;
     }
     }
$sub=new sub_class(100);

$sub->double();
$double_sum=$sub->return_value();
echo"<h1>100ÀÇ °öÀº ".$double_sum."ÀÌ´Ù.</h1><br>";

$sub->add(20);
$add_sum=$sub->return_value();
echo"<h1>".$double_sum."¿¡¼­ 20À» ´õÇÑ °ªÀº ".$add_sum."ÀÌ´Ù.</h1><br>";

$sub->division();
$division_sum=$sub->return_value();
echo"<h1>".$add_sum." ³ª´©±â 2´Â ".$division_sum."ÀÌ´Ù.</h1>";

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