标签:style http color cti io div
主要区别是两个或者多个数组中如果出现相同键名,键名分为字符串或者数字,需要注意
1)键名为数字时,array_merge()不会覆盖掉原来的值,但+合并数组则会把最先出现的值作为最终结果返回,而把后面的数组拥有相同键名的那些值“抛弃”掉(不是覆盖)
2)键名为字符时,+仍然把最先出现的值作为最终结果返回,而把后面的数组拥有相同键名的那些值“抛弃”掉,但array_merge()此时会覆盖掉前面相同键名的值
<?php
$array1 = array(0 => ‘zero_a‘, 2 => ‘two_a‘, 3 => ‘three_a‘);
$array2 = array(1 => ‘one_b‘, 3 => ‘three_b‘, 4 => ‘four_b‘);
$result = $array1 + $array2;
var_dump($result);
?>
array(5) { [0]=> string(6) "zero_a" [2]=> string(5) "two_a" [3]=> string(7) "three_a" [1]=> string(5) "one_b" [4]=> string(6) "four_b" }
<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>
Array ( [color] => green [0] => 2 [1] => 4 [2] => a [3] => b [shape] => trapezoid [4] => 4 )
http://www.php.net/manual/zh/function.array-merge.php
另有函数array_merge_recursive()可对比学习。
php 合并数组 "+"和"array_merge"的区别,布布扣,bubuko.com
标签:style http color cti io div
原文地址:http://www.cnblogs.com/eterwei/p/3822268.html