How to create a PHP library and test it?

Create a PHP function library: create a directory and a file, and define functions. Test the PHP function library: Create a test file, include the function library file, write test cases, and run the test file. Practical case: The sample function library is used to calculate the area of ​​geometric shapes, and the test file is used to verify the results.

How to create a PHP library and test it

Create a PHP library

To create a PHP library, follow these steps:

1. Create a new directory, for example my_library.
2. In this directory, create a new file, such as my_functions.php.
3. In the file, define your function, for example:

<?php

function addNumbers($num1, $num2)
{
    return $num1 + $num2;
}

?>

4. Save the file.

Test the PHP function library

To test the PHP function library, please perform the following steps:

1. In the my_library directory, Create a new file, for example test_my_functions.php.
2. In the file, include your function library file, for example:

<?php

require 'my_functions.php';

?>

3. In the file, write the test case, for example:

<?php

$num1 = 10;
$num2 = 5;
$expectedSum = 15;

$sum = addNumbers($num1, $num2);

if ($sum === $expectedSum) {
    echo "Pass" . PHP_EOL;
} else {
    echo "Fail" . PHP_EOL;
}

?>

4. save document.
5. Run the test file, for example:

php test_my_functions.php

Expected output:

Pass

Practical case

Here's how to create a test file for calculating geometry Example of area PHP function library:

// my_geometry_functions.php

<?php

function calculateAreaSquare($sideLength)
{
    return $sideLength * $sideLength;
}

function calculateAreaRectangle($length, $width)
{
    return $length * $width;
}

function calculateAreaCircle($radius)
{
    return pi() * ($radius * $radius);
}

?>

To test this function library, we can create a test file:

// test_my_geometry_functions.php

<?php

require 'my_geometry_functions.php';

$sideLength = 5;
$expectedAreaSquare = 25;

$areaSquare = calculateAreaSquare($sideLength);

if ($areaSquare === $expectedAreaSquare) {
    echo "Pass: Square" . PHP_EOL;
} else {
    echo "Fail: Square" . PHP_EOL;
}

$length = 10;
$width = 5;
$expectedAreaRectangle = 50;

$areaRectangle = calculateAreaRectangle($length, $width);

if ($areaRectangle === $expectedAreaRectangle) {
    echo "Pass: Rectangle" . PHP_EOL;
} else {
    echo "Fail: Rectangle" . PHP_EOL;
}

$radius = 3;
$expectedAreaCircle = 28.27;

$areaCircle = calculateAreaCircle($radius);

if (abs($areaCircle - $expectedAreaCircle) <= 0.01) {
    echo "Pass: Circle" . PHP_EOL;
} else {
    echo "Fail: Circle" . PHP_EOL;
}

?>

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