PHP assertion error

Introduction

AssertionErrorclass is a subclass ofErrorclass. This type of error is thrown whenassert()returns FALSE

assert() checks whether the given assertion is true or false, and if false, throws an AssertionError. The assert() function is defined as follows -

Syntax

for PHP 5 and PHP 7 assert ( mixed $assertion [, string $description ] ) : bool PHP 7 only assert ( mixed $assertion [, Throwable $exception ] ) : bool

Parameters

Starting in PHP 7.0, assert() is now a language construct rather than a function.assertionThe parameter can now be an expression, and the second parameter can be an exception or a description. Starting with PHP 7.2, string descriptions emit theE_DEPRECATEDmessage. The AssertionError thrown by assert() will only be sent to the catch block ifassert.exception=onis enabled inphp.ini.

AssertionError Example

In this example, we assert that the condition is true and the try block executes normally. If the condition is false, an AssertionError message will be displayed from the catch block.

Example

Live Demonstration

getMessage(); } ?>

Output

This will produce the following results -

assert(10 == 20) failed.

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