Check if variable exists inside class

I have the following PHP class:
class Class1
     public $var1;
     public $var2;
     public $var3;

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How can I check if specific variable name is existed in Class1 or not?
LVL 12
Mohamed AbowardaSoftware EngineerAsked:
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Ray PaseurCommented:
You might be able to use this function:
Mohamed AbowardaSoftware EngineerAuthor Commented:
I see that the function get_defined_vars() return array of all the defined variables, I only need to get the variables I defined in the class "$var1, $var2, and $var3".

How can I do that?
Greg AlexanderLead DeveloperCommented:
echo "<pre>";
echo "</pre>";

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Chris StanyonWebDevCommented:
You can use this to check if a specific variable exists. It will only return true for publicly visible vars.

echo (property_exists('Class1', 'var1')) ? "true\n" : "false\n";

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Mohamed AbowardaSoftware EngineerAuthor Commented:
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