php unset array does not work

<code>$exchangeName= array (
    9000 =>
        array (
            0 => '正常充值1',
            1 => 4.99,
        ),
    9003 =>
        array (
            0 => '正常充值4',
            1 => 49.99,
        ),
    9152 =>
        array (
            0 => '一次性促销4',
            1 => 99.99,
        ),);
$qin = var_export($exchangeName);
//echo $qin;

$contents="444,name,0.99|555,name,9.99";
$packageArray=explode('|', $contents);

unset($exchangeName);
foreach ($packageArray as $packageValue){
 $temp=explode(',', $packageValue);
 $exchangeName[$temp[0]]=array($temp[1],$temp[2]);
}

echo var_export($exchangeName,true);</code>

Reply content:

<code>$exchangeName= array (
    9000 =>
        array (
            0 => '正常充值1',
            1 => 4.99,
        ),
    9003 =>
        array (
            0 => '正常充值4',
            1 => 49.99,
        ),
    9152 =>
        array (
            0 => '一次性促销4',
            1 => 99.99,
        ),);
$qin = var_export($exchangeName);
//echo $qin;

$contents="444,name,0.99|555,name,9.99";
$packageArray=explode('|', $contents);

unset($exchangeName);
foreach ($packageArray as $packageValue){
 $temp=explode(',', $packageValue);
 $exchangeName[$temp[0]]=array($temp[1],$temp[2]);
}

echo var_export($exchangeName,true);</code>

unset is to release the specified variable. You definitely can’t unset the two-dimensional array directly! Reference Manual

Didn’t you reassign the values ​​below?