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@ 2020-05-22T05:03:10Z

<?php

// Verifies the known return-values of bc functions
$cases = [
    'null' => [
        bcdiv('10', '0'),
        bcmod('10', '0'),
        bcsqrt('-10', 0),
        bcsqrt('-10')
    ],
    
    'string' => [
        bcdiv('10', '-1'),
        bcdiv('10', '1'),
        bcmod('10', '-1'),
        bcmod('10', '1'),
        bcsqrt('10', 1),
        bcsqrt('10', -1),
        bcsqrt('10'),
        bcpowmod('10', '0', '-2'),
        bcpowmod('10', '1', '2'),
    ],
    
    'false' => [
        bcpowmod('10', '-2', '-1'),
        bcpowmod('10', '-2', '0'),
        bcpowmod('10', '-2', '1'),
        bcpowmod('10', '2', '0'),
        bcpowmod('10', '0', '0')
    ]
];

$didFail = false;

foreach($cases as $expected => $actualValues) {
    $caseNum = 1;
            
    foreach ($actualValues as $actualValue) {
        $isCorrect = assertCorrectType($expected, $actualValue, $caseNum);
        $caseNum++;
        
        if($isCorrect === false) {
            $didFail = true;
        }
    }
}

echo "\n\n";

if ($didFail) {
    echo "An assertion failed!";
} else {
    echo "Everything OK!";
}

echo "\n\n";

print_r($cases);


function assertCorrectType($expected, $actualValue, $caseNum)
{
    $formattedActualValue = json_encode($actualValue);

    switch($expected) {
        case "false":
            $test = $actualValue === false;
            break;
            
        case "null":
            $test = $actualValue === null;
            break;
        
        case "string":
            $test = gettype($actualValue) === 'string';
            break;
        
    }

    if ($test !== true) {
        echo "Testcase {$caseNum} for '{$expected}' expectations failed. It was {$formattedActualValue}.\n";
        
        return false;
    }
    
    return true;
}

Output for 7.3.32, 7.4.26, 7.4.33, 8.0.13, 8.5.1 - 8.5.3: Fatal error: Uncaught Error: Call to undefined function bcdiv() in /in/RWD9r:6 Stack trace: #0 {main} thrown in /in/RWD9r on line 6
Process exited with code 255.
Output for 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0: Fatal error: Uncaught DivisionByZeroError: Division by zero in /in/RWD9r:6 Stack trace: #0 /in/RWD9r(6): bcdiv('10', '0') #1 {main} thrown in /in/RWD9r on line 6
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.32: Warning: bcdiv(): Division by zero in /in/RWD9r on line 6 Warning: bcmod(): Division by zero in /in/RWD9r on line 7 Warning: bcsqrt(): Square root of negative number in /in/RWD9r on line 8 Warning: bcsqrt(): Square root of negative number in /in/RWD9r on line 9 Everything OK! Array ( [null] => Array ( [0] => [1] => [2] => [3] => ) [string] => Array ( [0] => -10 [1] => 10 [2] => 0 [3] => 0 [4] => 3.1 [5] => 3 [6] => 3 [7] => 1 [8] => 0 ) [false] => Array ( [0] => [1] => [2] => [3] => [4] => ) )

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