PHP中的数组+运算符？

Question

PHP中的数组+运算符？$test = array('hi');$test += array('test','oh');var_dump($test);+PHP中的数组意味着什么？

Answer 1

小心使用数字键，如果它们应该被保留或者你不想丢失任何东西

$a = array(2 => "a2", 4 => "a4", 5 => "a5");

$b = array(1 => "b1", 3 => "b3", 4 => "b4");

联盟

print_r($a+$b);

Array

(

    [2] => a2

    [4] => a4

    [5] => a5

    [1] => b1

    [3] => b3

)

合并

print_r(array_merge($a, $b));

Array

(

    [0] => a2

    [1] => a4

    [2] => a5

    [3] => b1

    [4] => b3

    [5] => b4

)