Boşluk ve Null Farkı

• 09-05-2019
• Admin
• 44752 Okunma
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$a='';
$b=null;
 
if(isset($a)): echo "isset '' = true <br>"; else: echo "isset '' = false <br>"; endif;
if(isset($b)): echo "isset null = true <br>"; else: echo "isset null = false <br>"; endif;
echo "<br>";
if(empty($a)): echo "empty '' = true <br>"; else: echo "empty '' = false <br>"; endif;
if(empty($b)): echo "empty null = true <br>"; else: echo "empty null = false <br>"; endif;
echo "<br>";
if(is_null($a)): echo "is_null '' = true <br>"; else: echo "is_null '' = false <br>"; endif;
if(is_null($b)): echo "is_null null = true <br>"; else: echo "is_null null = false <br>"; endif;
echo "<br>";
if($a==$b): echo "''==null true <br>"; else: echo "''==null false <br>"; endif;
if($a===$b): echo "''===null true <br>"; else: echo "''===null false <br>"; endif;

Çıktı :

isset ” = true
isset null = false

empty ” = true
empty null = true

is_null ” = false
is_null null = true

”==null true
”===null false