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<?php class Smth { public function __get($name) { echo "Get: $name\n"; return $name == "abc" ? null : 0; } public function __set($name, $value) { echo "Set: $name to $value\n"; } } $x = new Smth(); $x->abc ??= 7; $x->cde ??= 8;
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.13
Get: abc Set: abc to 7 Get: cde
Output for 7.3.33
Parse error: syntax error, unexpected '=' in /in/GKlnG on line 15
Process exited with code 255.

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