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($t[0] == $s[0] && $t[0] == $e[0]) ? $r[0] = 1 : $r[0] = 0;

if ($t[0] == $s[0] && $t[0] == $e[0]){
   $r[0] = 1;
...
else{
   $r[0] = 0;
}