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<?php echo '------------ Teste ------------' . PHP_EOL; $variavel = 'teste'; var_dump(isset($variavel), is_null($variavel)); echo '------------ NULL ------------' . PHP_EOL; $variavel = null; var_dump(isset($variavel), is_null($variavel)); echo '------------ Unset ------------' . PHP_EOL; unset($variavel); var_dump(isset($variavel), is_null($variavel));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
------------ Teste ------------ bool(true) bool(false) ------------ NULL ------------ bool(false) bool(true) ------------ Unset ------------ Warning: Undefined variable $variavel in /in/4WumW on line 13 bool(false) bool(true)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 ------------ Teste ------------ bool(true) bool(false) ------------ NULL ------------ bool(false) bool(true) ------------ Unset ------------ Warning: Undefined variable $variavel in /in/4WumW on line 13 bool(false) bool(true)
Output for 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
------------ Teste ------------ bool(true) bool(false) ------------ NULL ------------ bool(false) bool(true) ------------ Unset ------------ Notice: Undefined variable: variavel in /in/4WumW on line 13 bool(false) bool(true)
Output for 7.3.32, 7.4.26
------------ Teste ------------ bool(true) bool(false) ------------ NULL ------------ bool(false) bool(true) ------------ Unset ------------ bool(false) bool(true)
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