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【PHP】4種類のnull判定

環境

Laravel v9.5.1 (PHP v8.1.3)

null判定

is_null

if (is_null($hoge)) {
   echo 'nullだよ';
}

=> "nullだよ"

empty

if (empty($hoge)) {
   echo 'nullだよ';
}

=> "nullだよ"

==

if ($hoge == null ) {
   echo 'nullだよ';
}

=> "nullだよ"

===

値と型が完全に一致しているか判定できる。

if ($hoge === null ) {
   echo 'nullだよ';
}

=> "nullだよ"

参考

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