function isInAlphabeticalOrder($s) {
for ($i = 0; $i < strlen($s) - 1; $i++) {
if ($s[$i] >= $s[$i + 1]) {
return 0;
}
}
return true;
}
$s1 = "java c c++";
echo isInAlphabeticalOrder($s1) . "\n";
$s2 = "abcxyz";
echo isInAlphabeticalOrder($s2) . "\n";
/*
run:
0
1
*/