<?php preg_split( string $pattern, string $subject, int $limit = -1, int $flags = 0): array|false
<?php if (! preg_match('/:\s*/', $header)) { return strlen($header); } [$name, $value] = preg_split('/:\s*/', $header, 2); $name = strtolower($name); $value = trim($value); if ($name === 'lambda-runtime-aws-request-id') {