strtolower

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Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Make a string lowercase
strtolower(string $string): string
                return strlen($header);

            }

            [$name, $value] = preg_split('/:\s*/', $header, 2);

            $name = strtolower($name);

            $value = trim($value);

            if ($name === 'lambda-runtime-aws-request-id') {

                $contextBuilder->setAwsRequestId($value);
src/Runtime/LambdaRuntime.php