OtlpSerializer.php

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<?php
namespace Wikimedia\Telemetry;
 
class OtlpSerializer {
    private const TYPE_MAP = [
        'string' => 'stringValue',
        'integer' => 'intValue',
        'boolean' => 'boolValue',
        'double' => 'doubleValue',
        'array' => 'arrayValue'
    ];
 
    public static function serializeKeyValuePairs( array $keyValuePairs ): array {
        $serialized = [];
 
        foreach ( $keyValuePairs as $key => $value ) {
            $type = gettype( $value );
 
            if ( isset( self::TYPE_MAP[$type] ) ) {
                $serialized[] = [
                    'key' => $key,
                    'value' => [ self::TYPE_MAP[$type] => $value ]
                ];
            }
        }
 
        return $serialized;
    }
}