PHP : Cannot use a scalar value as an array

$score[0] = 1; $score[1] = 1; $score[2] = 1; $score[3] = 1;

$limite = count($score);
$total= 0;
for ($n = 0 ; $n < $limite ; $n++)
{
$total = $total + $score[$n];
}

Warning: Cannot use a scalar value as an array in.....

$score[0] = 1; $score[1] = 1; $score[2] = 1; $score[3] = 1;  
$limite = count($score);  
$total= 0;  
for ($n = 0 ; $n < $limite ; $n++)  
{  
$total = $total + $score[$n];  
}

echo $total

score = array(
'0' => 1,
'1' => 1,
'2' => 1,
'3' => 1,
);

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