OtlpSerializer.php
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OtlpSerializer.php
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	<?php
	namespace Wikimedia\Telemetry;

	/**
	* Utility class for serializing data in OTLP JSON format.
	*
	* @since 1.43
	* @internal
	*/
	class OtlpSerializer {
	/**
	* Map of PHP types to their corresponding type name used in the OTLP JSON format.
	*/
	private const TYPE_MAP = [
	'string' => 'stringValue',
	'integer' => 'intValue',
	'boolean' => 'boolValue',
	'double' => 'doubleValue',
	'array' => 'arrayValue'
	];

	/**
	* Serialize an associative array into the format expected by the OTLP JSON format.
	* @param array $keyValuePairs The associative array to serialize
	* @return array
	*/
	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;
	}
	}