How to properly use PHP7 expectations

php7Expect backward-compatible enhancements to the old assert() function. Expectations allow zero-cost assertions in production code and provide the ability to throw custom exceptions when assertions fail. assert() is not a language construct where the first argument is a comparison of an expression string or boolean for testing.

Configuration directive assert()

• Assertion - Assertion. In

  PHP 5, it must be a string to be evaluated or a boolean value to be tested. In PHP 7, this can also be any expression that returns a value that will be executed and the result used to indicate whether the assertion succeeded or failed.

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

• 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.

FALSE, otherwise it returns TRUE .

<?php
   ini_set(&#39;assert.exception&#39;, 1);

   class CustomError extends AssertionError {}

   assert(false, new CustomError(&#39;Custom Error Message!&#39;));
?>

Fatal error: Uncaught CustomError: Custom Error Message! in...

php video tutorial php7 tutorial

The above is the detailed content of How to properly use PHP7 expectations. For more information, please follow other related articles on the PHP Chinese website!