PHP/Language Basics/Assertion

Assertion Options

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Constant Name Default Description

ASSERT_ACTIVE true Are assertions enabled?

ASSERT_WARNING true Should assertions cause standard PHP warnings?

ASSERT_BAIL false Should failed assertions cause the script to halt?

ASSERT_QUIET_EVAL false If an error occurs valuating an assertion when passed a string, should it report an error?

ASSERT_CALLBACK NULL The name of the function to call if an assertion fails.

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Using the assert() Function

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<?php

   function add_odd_numbers($x, $y) {
       assert("!(($x % 2) && ($y % 2))");
       return ($x + $y);
   }
   $answer_one = add_odd_numbers(3, 5);
   $answer_two = add_odd_numbers(2, 4);
   echo "3 + 5 = $answer_one\n";
   echo "2 + 4 = $answer_two\n";

?>

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