Is This How You Check If $Var Value Exists Or Not ?

Hi,

Like this I just checked if a $var value exists or not.

1

[code]

//Result: Warning: Undefined variable $var in C:xampphtdocsWorkgulfTest.php on line 10
if(!$var)
{
die(‘No VAR’); echo ‘<br>’; //Triggered.
}
else
{
die(‘VAR’); echo ‘<br>’;
}

[/code]

2

[code]

$var = ”;

if(!$var)
{
die(‘No VAR’); echo ‘<br>’; //Triggered.
}
else
{
die(‘VAR’); echo ‘<br>’;
}

[/code]

3

[code]

$var = “”;

if(!$var)
{
die(‘No VAR’); echo ‘<br>’; //Triggered.
}
else
{
die(‘VAR’); echo ‘<br>’;
}

[/code]

4

[code]

$var = NULL;

if(!$var)
{
die(‘No VAR’); echo ‘<br>’; //Triggered.
}
else
{
die(‘VAR’); echo ‘<br>’;
}

[/code]

5

[code]

$var = ‘NULL’;

if(!$var)
{
die(‘No VAR’); echo ‘<br>’;
}
else
{
die(‘VAR’); echo ‘<br>’; //Triggered.
}

[/code]

6

[code]

$var = “NULL”;

if(!$var)
{
die(‘No VAR’); echo ‘<br>’;
}
else
{
die(‘VAR’); echo ‘<br>’; //Triggered.
}

[/code]

From the looks of the first example, it seems like this you can test if the $var itself exists or not. Meaning, does a var exist in that name or not. Right ?

Also in #PHP _↴