mb_strtolower

Function • Params and return types changed in PHP 8.0

Make a string lowercase.

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2
PHP 8.3
PHP 8.4
PHP 8.5

mb_strtolower Function synopsis

mb_strtolower(string $string, ?string $encoding = null): string

Parameters

$string

Typestring

The string being lowercased.

$encoding

OptionalType?stringDefault valuenull

Return value

Typestring

$string with all alphabetic characters converted to lowercase.

Changes to the mb_strtolower Function

PHP 8.0

  • Return type added: string
  • Parameter name of parameter #1 changed: $sourcestring to $string
  • Parameter type added for parameter #1 ($string): string
  • Parameter type added for parameter #2 ($encoding): ?string
  • Parameter default value added for position #2 ($encoding): null
- mb_strtolower($sourcestring, $encoding)
+ mb_strtolower(string $string, ?string $encoding = null): string

mb_strtolower Function Availability

PHP VersionAvailability
PHP 8.5Future Release Yes
PHP 8.4Upcoming Release Yes
PHP 8.3Supported (Latest) Yes
PHP 8.2Supported Yes
PHP 8.1Security-Fixes Only Yes
PHP 8.0Unsupported Yes
PHP 7.4Unsupported Yes
PHP 7.3Unsupported Yes
PHP 7.2Unsupported Yes
PHP 7.1Unsupported Yes
PHP 7.0Unsupported Yes
PHP 5.6Unsupported Yes
PHP 5.5Unsupported Yes
PHP 5.4Unsupported Yes
PHP 5.3Unsupported Yes