PHP unset Array does not work

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

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

unsetis to release the specified variable. Your direct unset two-dimensional array definitely not! Reference Manuals

Don't you have a re-assignment down here?

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