1、问题
$list = [
['id'=>1, 'name'=>'不知火舞', 'location'=>'中单'],
['id'=>2, 'name'=>'橘右京', 'location'=>'打野'],
['id'=>3, 'name'=>'马可波罗', 'location'=>'ADC'],
];
foreach ($list as &$item){
$item['class'] = '刺客';
}
$list2 = [];
foreach ($list as $item){
$list2[] = $item;
}
var_dump($list2);
/*
--$list2
array:3 [
0 => array:4 ["id" => 1, "name" => "不知火舞", "location" => "中单", "class" => "刺客"]
1 => array:4 ["id" => 2, "name" => "橘右京", "location" => "打野", "class" => "刺客"]
2 => array:4 ["id" => 2, "name" => "橘右京", "location" => "打野", "class" => "刺客"]
]
*/
2、原因
原来是因为在遍历时使用引用,当第二次遍历数组时,数组的指针 $item
还是指向数组的末尾的元素,当重新赋值时 $item 指向的数组的末尾的元素就被修改了
解决办法是在第一次遍历完成之后就将$item unset()掉。
3、解决
$list = [
['id'=>1, 'name'=>'不知火舞', 'location'=>'中单'],
['id'=>2, 'name'=>'橘右京', 'location'=>'打野'],
['id'=>3, 'name'=>'马可波罗', 'location'=>'ADC'],
];
foreach ($list as &$item){
$item['class'] = '刺客';
}
unset($item);//第一次遍历完成之后就将$item销毁
$list2 = [];
foreach ($list as $item){
$list2[] = $item;
}
var_dump($list2);
/*
--$list2
array:3 [
0 => array:4 ["id" => 1, "name" => "不知火舞", "location" => "中单", "class" => "刺客"]
1 => array:4 ["id" => 2, "name" => "橘右京", "location" => "打野", "class" => "刺客"]
2 => array:4 ["id" => 3, "name" => "马可波罗", "location" => "ADC", "class" => "刺客"]
]
*/
原创文章,作者:kirin,如若转载,请注明出处:https://blog.ytso.com/275204.html