Getting a variable from an object with a string in PHP

I have a Persons object. It has a variable name accessible by saying

$p = new Person('John');
echo $p->name;

Now I have a string.

$name = 'name';

I need to get $p->name using $p and $name. Something like

echo $p->[$name];开发者_运维问答

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echo $p->{$name};

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echo $p->$name;

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echo $p->$name; may generates error if it contains special characters so following one is perfect

echo $p->{$name};