PHP-如何在数组内合并数组
如何在PHP中合并n个数组 我的意思是我怎么可以这样做的工作:
array_merge(from : $result[0], to : $result[count($result)-1])
array_merge_recursive(from: $result[0], to : $result[count($result) -1])
$result
里面有多个数组的数组在哪里,像这样:
$result = Array(0 => array(),//associative array
1 => array(),//associative array
2 => array(),//associative array
3 => array()//associative array
)
我的结果是:
$result = Array( 0 => Array(
"name" => "Name",
"events" => 1,
"types" => 2
),
1 => Array(
"name" => "Name",
"events" => 1,
"types" => 3
),
2 => Array(
"name" => "Name",
"events" => 1,
"types" => 4
),
3 => Array(
"name" => "Name",
"events" => 2,
"types" => 2
),
4 => Array(
"name" => "Name",
"events" => 3,
"types" => 2
)
)
我需要的是
$result = Array("name" => "name",
"events" => array(1,2,3),
"types" => array(2,3,4)
)
回答:
array_merge可以接受可变数量的参数,因此,使用一些call_user_func_array技巧,您可以将$result
数组传递给它:
$merged = call_user_func_array('array_merge', $result);
基本上可以像输入以下内容一样运行:
$merged = array_merge($result[0], $result[1], .... $result[n]);
更新:
现在有了5.6,我们有了...
运算符来将数组解压缩为参数,因此您可以:
$merged = array_merge(...$result);
并具有相同的结果。*
*如果在解压缩数组中具有整数键,则结果相同,否则会出现E_RECOVERABLE_ERROR : type 4096 -- Cannot unpack array with string keys
错误。
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