[SOLVED] Determining If a Variable Exists ?, don't understand

[shoutdots]

hello people,

 

please i need someone to explain to me what the point from " Determining If a Variable Exists " and using isset() ( with simple example ).

 

thank you for helping

[php_joe]

Like this:

 

<?php
if (isset($var)) {
    echo "This var is set so I will print.";
}
?>

 

run the document like this: test.php?var=1 and test.php?var= and you can see the difference.

[shoutdots]

Tell if this right

 

you give an example that when i put a value ( any value ) to the $var, thats mean isset() will see that there is a vaule and display echo msg ?

[php_joe]

Tell if this right

 

you give an example that when i put a value ( any value ) to the $var, thats mean isset() will see that there is a vaule and display echo msg ?

 

Yes

[cooldude832]

ISSET()  (should be caps) is a function that returns a boolean yes/no if the given parameter is not false or undefined.

 

so you can say if(!ISSET()) and if the var is not set it will execute the if block.  Generally its only used in if/else if cases.

[wildteen88]

ISSET()  (should be caps) ...

Where in the manual does it say that?

 

isset is not case sensitive In fact all functions within PHP are case insensitive.

[shoutdots]

thank you very much for helping

got it now