- substr: documentation ( source)
- var_dump: documentation ( source)
- ceil: documentation ( source)
- strrev: documentation ( source)
<?php
function ean_checksum($eancode) {
$result = false;
if(strlen($eancode) == 13) {
$check_code = substr($eancode, 12, 1);
$eancode = substr($eancode, 0, 12);
$oddsum=0;
$evensum=0;
$total=0;
$eanvalue=$eancode;
$finalean = strrev(substr($eanvalue,0,12));
for($i=0;$i<strlen($finalean);$i++) {
if(($i % 2) == 0) {
$oddsum += intval($finalean[$i]);
}
else {
$evensum += intval($finalean[$i]);
}
}
$total = ($oddsum * 3) + $evensum;
$check = intval(10 - ceil($total % 10.0)) %10;
if($check == $check_code) {
$result = true;
}
}
return $result;
}
$t = '3603912289411';
var_dump(ean_checksum($t));