False values in PHP

<?php
if('')
{
    echo 'True';
}
else
{
    echo 'False';
}
// outputs False

if(0)
{
    echo 'True';
}
else
{
    echo 'False';
}
// outputs False

if(null)
{
    echo 'True';
}
else
{
    echo 'False';
}
// outputs False
?>

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