php地址和值引用
function test(){
$datas = [100,200,300,400];
foreach ($datas as &$item){
}
foreach ($datas as $item){
}
dump($datas);
} |
输出如下
array(4) {
[0] => int(100)
[1] => int(200)
[2] => int(300)
[3] => &int(300)
}
function testaa(){
$datas = [100,200,300,400];
foreach ($datas as &$item){
}
foreach ($datas as $item){
dump($datas);
}
} |
输出如下
array(4) {
[0] => int(100)
[1] => int(200)
[2] => int(300)
[3] => &int(100)
}
array(4) {
[0] => int(100)
[1] => int(200)
[2] => int(300)
[3] => &int(200)
}
array(4) {
[0] => int(100)
[1] => int(200)
[2] => int(300)
[3] => &int(300)
}
array(4) {
[0] => int(100)
[1] => int(200)
[2] => int(300)
[3] => &int(300)
}
解决方法如下：
function test(){
$datas = [100,200,300,400];
foreach ($datas as &$item){
}
foreach ($datas as $itemOrder){
}
dump($datas);
} |
function test(){
$datas = [100,200,300,400];
foreach ($datas as &$item){
}
unset($item); // 取消引用
foreach ($datas as $itemOrder){
}
dump($datas);
} |
参考地址 https://zhidao.baidu.com/question/2081052214131826308.html