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@ 2021-12-01T11:01:51Z

<?php

$GLOBALS["x"] = $GLOBALS["x"] ?? [];
var_dump($GLOBALS["x"]);
$GLOBALS["y"] ??= [];
var_dump($GLOBALS["y"]);

Output
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References
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var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

25.95 ms | 404 KiB | 5 Q