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<?php |
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declare(strict_types=1); |
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namespace MartinGeorgiev\Utils; |
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use MartinGeorgiev\Utils\Exception\InvalidArrayFormatException; |
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/** |
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* Handles transformation from PHP values to PostgreSQL values. |
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* |
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* @since 3.0 |
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* |
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* @author Martin Georgiev <[email protected]> |
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*/ |
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class PHPArrayToPostgresValueTransformer |
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{ |
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private const POSTGRESQL_EMPTY_ARRAY = '{}'; |
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/** |
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* Transforms a PHP array to a PostgreSQL text array. |
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* This method supports only single-dimensioned PHP arrays. |
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* This method relays on the default escaping strategy in PostgreSQL (double quotes). |
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* |
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* @throws InvalidArrayFormatException when the input is a multi-dimensional array or has invalid format |
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*/ |
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public static function transformToPostgresTextArray(array $phpArray): string |
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{ |
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if ($phpArray === []) { |
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return self::POSTGRESQL_EMPTY_ARRAY; |
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} |
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if (\array_filter($phpArray, 'is_array')) { |
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throw InvalidArrayFormatException::multiDimensionalArrayNotSupported(); |
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} |
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/** @var array<int|string, string> */ |
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$processed = \array_map( |
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static fn (mixed $value): string => self::formatValue($value), |
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$phpArray |
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); |
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return '{'.\implode(',', $processed).'}'; |
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} |
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/** |
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* Formats a single value for PostgreSQL array. |
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*/ |
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private static function formatValue(mixed $value): string |
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{ |
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if ($value === null) { |
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return 'NULL'; |
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} |
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if (\is_int($value) || \is_float($value)) { |
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return (string) $value; |
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} |
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if (\is_bool($value)) { |
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return $value ? 'true' : 'false'; |
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} |
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if (\is_object($value)) { |
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if (\method_exists($value, '__toString')) { |
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$stringValue = $value->__toString(); |
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} else { |
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// For objects without __toString, use a default representation |
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$stringValue = $value::class; |
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} |
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} elseif (\is_resource($value)) { |
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$stringValue = '(resource)'; |
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} else { |
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$valueType = \get_debug_type($value); |
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if ($valueType === 'string') { |
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$stringValue = $value; |
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} elseif (\in_array($valueType, ['int', 'float', 'bool'], true)) { |
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/** @var bool|float|int $value */ |
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$stringValue = (string) $value; |
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} else { |
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$stringValue = $valueType; |
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} |
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} |
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\assert(\is_string($stringValue)); |
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if ($stringValue === '') { |
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return '""'; |
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} |
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// Make sure strings are quoted, PostgreSQL will handle this gracefully |
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// Double the backslashes and escape quotes |
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$escaped = \str_replace( |
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['\\', '"'], |
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['\\\\', '\"'], |
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$stringValue |
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); |
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return '"'.$escaped.'"'; |
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} |
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} |
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martin-georgiev /
postgresql-for-doctrine
