assert

Checks if assertion is false

Syntax

assert(mixed $assertion, string $description = ?): bool
assert(mixed $assertion, Throwable $exception = ?): bool

Parameters

assertion

The assertion.

In PHP 5, this must be either a string to be evaluated or a bool to be tested.

In PHP 7, this may also be any expression that returns a value, which will be executed and the result used to indicate whether the assertion succeeded or failed.

Warning Using string as the assertion is DEPRECATED as of PHP 7.2.0 and REMOVED as of PHP 8.0.0.

description

An optional description that will be included in the failure message if the assertion fails.

From PHP 7, if no description is provided, a default description equal to the source code for the invocation of assert() is provided.

exception

In PHP 7, the second parameter can be a Throwable object instead of a descriptive string, in which case this is the object that will be thrown if the assertion fails and the assert.exception configuration directive is enabled.

Return

false if the assertion is false, true otherwise.

Examples

1 · assertion

<?

$assertion = true == false;

$return = assert($assertion);

var_export($return);

?>

			
		

2 · description

<?

$assertion = true == false;
$description = 'true is false';

$return = assert($assertion, $desctiption);

var_export($return);

?>

			
		

3 · exception

<?

class MyClass extends AssertionError{}

$assertion = true == false;
$exception = new MyClass('true is false');

$return = assert($assertion, $exception);

var_export($return);

?>

			
		

assert_options

cli_get_process_title

cli_set_process_title

dl

extension_loaded

gc_collect_cycles

gc_disable

gc_enable

gc_enabled

gc_mem_caches

gc_status

get_cfg_var

get_current_user

get_defined_constants

get_extension_funcs

get_include_path

get_included_files

get_loaded_extensions

get_required_files

get_resources

getenv

getlastmod

getmygid

getmyinode

getmypid

getmyuid

getopt

getrusage

ini_alter

ini_get

ini_get_all

ini_restore

ini_set

memory_get_peak_usage

memory_get_usage

memory_reset_peak_usage

php_ini_loaded_file

php_ini_scanned_files

php_sapi_name

php_uname

phpcredits

phpinfo

phpversion

putenv

set_include_path

set_time_limit

sys_get_temp_dir

version_compare

zend_thread_id

zend_version

PHP

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