总和两个PHP

Question

数组值我有两个饼干，它们的值是这样的：

foreach($_COOKIE as $key=>$val) { 
    $piece = explode(",", $val); 
    $t_cost = array($piece[3]); 
    print_r($t_cost); //It prints Array ([0] => 11) Array ([0] => 11) 
    echo $total_cost = array_sum($t_cost); 
} 

但它打印只有一个值。我怎样才能添加这两个值来总结它们？

Answer 1

我觉得你不需要array_sum，只需使用+ =运算符将节省一点记忆

$t_cost = 0; 
foreach($_COOKIE as $key=>$val) { 
    $piece = explode(",", $val); 
    $t_cost += $piece[3]; 
} 
echo $t_cost; 

Answer 2

实际上并不需要array_sum。

// the array where all piece[3] values are stored 
$t_cost = array(); 

// loop through array 
// just foreach($_COOKIE as $val) is enough 
foreach($_COOKIE as $key=>$val) { 

    // split by comma 
    $piece = explode(",", $val); 

    // add to array 
    $t_cost[] = $piece[3]; 

} 
// sum up 
$total_cost = array_sum($t_cost); 

或只是

$total = 0; 
foreach($_COOKIE as $key=>$val) { 
     $piece = explode(",", $val); 
     $total += $piece[3]; 
} 
echo $total; 

Answer 3

$total = 0; 
foreach($_COOKIE as $key=>$val) { 
     $piece = explode(",", $val); 
     $t_cost = trim(str_replace('$', '', array($piece[3])); 
     $total += (float)$t_cost; 
     echo "The total cost: $".$total; 
}