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--TEST--
Symfony Cache style negated static coalesce assignment condition
--FILE--
<?php
class SymfonyApcuSupportedCase
{
private static ?bool $supported = null;
public static int $checks = 0;
public static function probe(): bool
{
self::$checks++;
return false;
}
public static function createSystemCache(): string
{
if (!self::$supported ??= self::probe()) {
return 'fallback';
}
return 'apcu';
}
}
function main(): void
{
var_dump(SymfonyApcuSupportedCase::createSystemCache());
var_dump(SymfonyApcuSupportedCase::createSystemCache());
var_dump(SymfonyApcuSupportedCase::$checks);
}
?>
--EXPECT--
string(8) "fallback"
string(8) "fallback"
int(1)