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Sabit tanımlarken define komutu kullanılır. Bu komut değişken tamamlanmadan farklı olup adı üstünde, değişmeyen, yani sabit, içeriği değişmeyen bilgi için kullanılır.
Örneğin geometride kullanılan pi sayısı bbir sabittir.
Sabit Tanımlaması aşşağıdaki şekilde yapılır.
Örn: define("Sabit adi","Sabitin Değeri");
Sabit tanımlarken değişkenlerde olduğu gibi ön ek olarak dolar($) işareti kullanılmaz.
*Yarı çapı verilen bir dairenin alanını bulan programı pi sabit kullanarak yapınız
<?php
define("pi","3.14");
$r=5;
$alan = pi*$r*$r;
echo "=Alan=$alan";
?>
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*Verilen 2 sayıya 5 işlemi yapıp ekranda yazdırınız.
<?php
$a=20;
$b=5;
$toplam =$a + $b;
$cikarma = $a - $b;
$carpma = $a * $b;
$bolme = $a / $b;
$mod = $a % $b;
echo "Toplam=$toplam";
echo "<br>";
echo "Çıkarma =".$cikarma;
echo "<br>";
echo "Çarpma =".$carpma;
echo "<br>";
echo "Bölme =".$bolme;
echo "<br>";
echo "Mod =".$mod;
?>
----------------------------------------------------------------------------------------------------------------
Doç.Dr.Ahmet.Kürk ismini ayrı ayrı yazdır.
<?php
$unvan = "Doc.Dr";
$ad = "Ahmet";
$soyad = "Kürk";
$isim = $unvan." ".$ad." ".$soyad;
echo $isim;
?>
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