php 为 foreach() 提供的参数无效
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Invalid argument supplied for foreach()
提问by Jennifer Anthony
How can fix error Message: Invalid argument supplied for foreach() - Line Number: 28in following foreach?
如何修复Message: Invalid argument supplied for foreach() - Line Number: 28以下错误foreach？
<?php
$mileage = array();
$mileage_input = $this->input->post('mileage');
foreach ($mileage_input as $idx => $name) { //Line 28
$mileage[] = array(
'mileage' => $mileage_input[$idx]
);
}
$data = array(
'mileage' => json_encode($mileage),
'customer_number' => $customer_number,
'name' => $this->input->post('name')
);
$this->db->insert('customer', $data);
?>
回答by Chris G.
$mileage_inputis probably not an array, which is why it isn't working.
$mileage_input可能不是数组，这就是它不起作用的原因。
回答by Alexander Olsson
Most likely $mileage_input is not an array. Perhaps you must error check $this->input->post.
很可能 $mileage_input 不是数组。也许您必须错误检查 $this->input->post。
If you dont really care about the error, but simply want to not get the error you can cast the value to an array before looping over it.
如果你真的不关心错误，只是不想得到错误，你可以在循环之前将值转换为数组。
foreach((array)$mileage_input as $idx => $name {
