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033-Managing strings with isset and unset in PHP
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033-string-isset-unset.php

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<?php
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function showName(? string $name = null):void {
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if (isset($name)) {
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echo "The name {$name} is set}\n";
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} else {
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echo "The name is not set\n";
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}
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}
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$name = "Joseph Climber";
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showName($name);
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unset($name);
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showName($name); //PHP Warning Message
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