PHP run function in class [closed]

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I have some code like this inside a file script.php:

class ABC
{
    public function sampleName() { do something}
}

Now if I run

php script.php 

from command line it doesn't do anything. I thought it would execute the function. Do I have to call the funciton sampleName somewhere inside the file? If so, how do I do this?

After the class ends should I say $this->SampleName()?

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instantiate your class -> call function:

class ABC
{
    function __construct { some code }
    public function sampleName() { do something}
}

$abc = new ABC(); // new instance of ABC
$abc->sampleName(); // we've done something

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Reading the manual also helps to understand the basics of OOP in PHP.

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After the class closing brace, create the object of the class.

$abc = new ABC();
$output = $abc->sampleName();
print $output;