php數組區別取值的四個函數學習

$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
?>

上例将输出： Array ( [a] => green [0] => red )

2.array_intersect_assoc() 在前一个函数的基础上，返回所有数组中键、值均相同的键值对。

例子：

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result_array = array_intersect_assoc($array1, $array2);
?>

上例将输出： Array ( [a] => green )

3.array_diff() 携带多个数组，返回第一个数组中有的而后面的数组中没有的所有的值组成的新数组，对应键取自第一个数组。

例子：

$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);
?>

上例将输出： Array ( [1] => blue )

4.array_diff_assoc() 在前一个函数的基础上，不仅需要匹配值还要匹配键。

例子：

$array1 = array ("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array ("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
?>

上例将输出： Array ( => brown [c] => blue [0] => red )