Local Variable

A local variable is a variable in a method or a function. It is in the local scope, and is not available anywhere else.

A local variable is created by assigning it a value in a method, using the static keyword, or using the extract() function. It might be removed by the unset() function.

<?php

function foo() {
    $localVariable = 1;
    // ... more code
}

function goo() {
    // this variable is distinct from the one in foo()
    $localVariable = 2;
    // ... more code
}

?>

See also https://www.educba.com/local-variable-in-php/

Related : Static Variables, extract(), unset(), Global Variables, Superglobal Variables