PHP: How do i create a dynamic salt?

READ ME:
What is a code that creates a strong dynamic salt based on the entered string that is different every time BUT the same when the same string is entered?

Thank You.
For example (this is my attempt):
function dynamicSalt($input1, input2) {
$dualInput = $input1.$input2;
$X = strlen($dualInput);
$Y = strripos($dualInput,'a').strripos($dualInput,'e').strripos($dualInput,'i').strripos($dualInput,'o').strripos($dualInput,'u');
$dynamicSalt = $X + $Y;
}
 
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