This is an implementation for a word ending in russian lang. Also as I know polish and similar langs use same rules:
<?php
function plural( $n )
{
if ( $n % 10 == 1 && $n % 100 != 11 )
{
return 0;
}
if ( $n % 10 >= 2 && $n % 10 <= 4 && ( $n % 100 < 10 || $n % 100 >= 20 ) )
{
return 1;
}
return 2;
}
for ( $i = 0; $i < 100; $i++ )
{
$x = plural( $i );
printf(
"%d тетрад%s<br/>\n", $i,
( 0 == $x ? 'ь' : ( 1 == $x ? 'и' : 'ей' ) )
);
}
?>
Output:
0 тетрадей
1 тетрадь
2 тетради
3 тетради
4 тетради
5 тетрадей
6 тетрадей
7 тетрадей
8 тетрадей
9 тетрадей
10 тетрадей
...
Also here is short version:
<?php
$n = 17;
print ($n%10==1 && $n%100!=11 ? 0 : ($n%10>=2 && $n%10<=4 && ($n%100<10 || $n%100>=20) ? 1 : 2));
?>
output: 2