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- <?php
- $str1 = "";
- $str2 = null;
- $str3 = 0;
- var_dump(is_null($str1)); // retorna false
- var_dump(is_null($str2)); // retorna true
- var_dump(is_null($str3)); // retorna false
- var_dump($str1 == null); // retorna true
- var_dump($str2 == null); // retorna true
- var_dump($str3 == null); // retorna true
- ?>
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