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@ 2021-04-23T00:21:35Z

<?php

$pens = 'words';

function pencils() {
    global $pens;
    $pens = null;
}

function puppies() {
    global $pens;
    var_dump( isset( $pens ) );
}

pencils();
puppies();

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive preview

61.7 ms | 402 KiB | 5 Q