A variable declared within a function has a LOCAL SCOPE and can only be accessed within that function:

SUBMITTED BY: henry1874w

DATE: June 4, 2017, 7:56 p.m.

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<?php
function myTest() {
    $x = 5; // local scope
    echo "<p>Variable x inside function is: $x</p>";
} 
myTest();

// using x outside the function will generate an error
echo "<p>Variable x outside function is: $x</p>";
?>