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@ 2015-12-18T10:06:02Z

<?php
$paymentAmount = '19.90';
$currencyExponent = 100;
$paymentAmount     = (int) ($paymentAmount * pow(10, $currencyExponent));
var_dump($paymentAmount);

$paymentAmount = '19.90';
$paymentAmount     = (int) bcmul($paymentAmount, pow(10, $currencyExponent));
var_dump($paymentAmount);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
pow: documentation ( source)

preferences:dark modelive preview

64.89 ms | 402 KiB | 5 Q