trait_exists

Function • Params and return types changed in PHP 8.0

Checks if the trait exists.

PHP 5.3

Added

PHP 5.5-5.6

PHP 7

Improved

PHP 8.1

PHP 8.2-8.3

PHP 8.4

PHP 8.5

PHP 8.6

`trait_exists` Function synopsis

trait_exists(string $trait, bool $autoload = true): bool

Parameters

`$trait`

Typestring

Name of the trait to check

`$autoload`

OptionalTypeboolDefault valuetrue

Whether to autoload if not already loaded.

Return value

Typebool

Returns true if trait exists, and false otherwise.

Changes to the `trait_exists` Function

PHP 8.0

Return type added: bool
Parameter name of parameter #1 changed: $traitname to $trait
Parameter type added for parameter #1 ($trait): string
Parameter type added for parameter #2 ($autoload): bool
Parameter default value added for position #2 ($autoload): true

- trait_exists($traitname, $autoload)
+ trait_exists(string $trait, bool $autoload = true): bool

PHP 5.4

Function added

`trait_exists` Function Availability

PHP Version	Availability
PHP 8.6Upcoming Release	Yes
PHP 8.5Supported (Latest)	Yes
PHP 8.4Supported	Yes
PHP 8.3Security-Fixes Only	Yes
PHP 8.2Security-Fixes Only	Yes
PHP 8.1Unsupported	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	No