Currency conversion

convert.php

<?php

/** @test */
public function it_converts_currency_to_cents_if_dollar_sign()
{
    $this->assertEquals(6500, convertCurrencyToCents('$65'));
    $this->assertEquals(6600, convertCurrencyToCents('$66.00'));
    $this->assertEquals(6750, convertCurrencyToCents('$67.50'));
    $this->assertEquals(2500, convertCurrencyToCents('25.00'));
    $this->assertEquals(3300, convertCurrencyToCents('33'));
    $this->assertEquals(1150, convertCurrencyToCents('$11.5'));
    $this->assertEquals(0, convertCurrencyToCents('$0.00'));
    $this->assertEquals(0, convertCurrencyToCents('0'));
    $this->assertEquals(0, convertCurrencyToCents('0.00'));
}


/**
 * Convert money from UI into cents
 *
 * @param $amount
 * @return int|string
 */
function convertCurrencyToCents($amount)
{
    $amount = str_replace('$', '', $amount);
    $amount = str_replace(',', '', $amount);
    $amount = str_replace(' ', '', $amount);

    // If theres a . we need to account for that.
    $newAmount = explode('.', $amount);

    // No decimal places given
    if (sizeof($newAmount) == 1) {
        return $newAmount[0] . '00';
    } else {
        // Sometimes, a user could put a single decimal place
        // Eg. $11.5
        if(strlen($newAmount[1]) === 1) {
            return $newAmount[0] . $newAmount[1] . '0';
        }
    }

    return intval($newAmount[0] . $newAmount[1]);
}