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<?php
declare(strict_types=1);
namespace OpenTelemetry\API\Instrumentation;
class ConfigurationResolver implements ConfigurationResolverInterface
{
public function has(string $name): bool
{
return $this->getVariable($name) !== null;
}
public function getString(string $name): ?string
{
return $this->getVariable($name);
}
public function getBoolean(string $name): ?bool
{
$value = $this->getVariable($name);
if ($value === null) {
return null;
}
return ($value === 'true');
}
public function getInt(string $name): ?int
{
$value = $this->getVariable($name);
if ($value === null) {
return null;
}
if (filter_var($value, FILTER_VALIDATE_INT) === false) {
//log warning
return null;
}
return (int) $value;
}
public function getList(string $name): array
{
$value = $this->getVariable($name);
if ($value === null) {
return [];
}
return explode(',', $value);
}
private function getVariable(string $name): ?string
{
$value = $_SERVER[$name] ?? null;
if ($value !== false && !self::isEmpty($value)) {
assert(is_string($value));
return $value;
}
$value = getenv($name);
if ($value !== false && !self::isEmpty($value)) {
return $value;
}
$value = ini_get($name);
if ($value !== false && !self::isEmpty($value)) {
return $value;
}
return null;
}
private static function isEmpty($value): bool
{
return $value === false || $value === null || $value === '';
}
}
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