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run code in 150+ php & hhvm versions
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<?php function shouldUpdateUsername($source, $existing) { if ($source !== $existing) { $pattern = sprintf('/^%s \[\d+\]$/', preg_quote($source, '/')); $processedBefore = preg_match($pattern, $existing) !== 1; $sourceAvailable = false; return $sourceAvailable || $processedBefore; } return false; } var_dump(shouldUpdateUsername('A [1]', 'AA [1]'));
based on kM3Ha
Output for 4.3.0 - 7.1.0
bool(true)