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Editorial Team
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Asked: 2026-06-17T05:37:52+00:00

The following PHP page <?php $a = World; function say() { echo $a; }

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The following PHP page

<?php
$a = "World";

function say() {
    echo $a;
}
?>

Hello, <?php say(); ?>

fails with:

Undefined variable: a in test.php on line 5

Could someone explain me why, and what is the best way to fix this?

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1 Answer

  1. Editorial Team

    you have to define variable as global inside the function

    <?php
 $a = "World";

function say() {
global $a;
echo $a;
}
 say(); 
?>
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