PHP/Language Basics/Assertion

Assertion Options

 
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.

Using the assert() Function

 
<?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";
?>