PHP非法字符串偏移量(illegal string offset)警告求助

Hey there, let's break down why you're hitting that illegal string offset warning and how to fix it.

The Root of the Problem #

Looking at your code snippet, the issue lies in how you're looping through your $data2 array:

$data2 = array(
    'EquipmentName' => $this->input->post('txt_equipb'),
    'EquipmentType' => $this->input->post('txt_equiptype'),
    'RequirementID' => $id2
);
foreach($data2 as $d) {
    $data2s = array('EquipmentName' => $d['Equipment...
}

When you use foreach($data2 as $d), each $d grabs the value of each key in your associative array—so $d becomes a string (like the input value from txt_equipb), not a sub-array. Trying to access $d['EquipmentName'] then treats that string as an array, which triggers the error.

How to Fix It #

You have two common scenarios here, depending on your use case:

Scenario 1: You're working with a single equipment entry

If you only need to create one $data2s entry from $data2, you don't need a loop at all. Just assign the array directly:

$data2 = array(
    'EquipmentName' => $this->input->post('txt_equipb'),
    'EquipmentType' => $this->input->post('txt_equiptype'),
    'RequirementID' => $id2
);
// Assign directly to $data2s
$data2s = $data2;
// Or wrap it in an array if you need it for a batch operation
$data2s = array($data2);

Scenario 2: You're submitting multiple equipment entries

If your form is set up to submit multiple pieces of equipment (e.g., repeated fields with [] in their names like txt_equipb[]), your initial array structure is incorrect. Instead, loop through the submitted arrays:

// Get array values from your form (ensure fields use name="txt_equipb[]")
$equipNames = $this->input->post('txt_equipb');
$equipTypes = $this->input->post('txt_equiptype');
$data2s = array();

// Loop through each entry to build your final array
foreach($equipNames as $index => $name) {
    $data2s[] = array(
        'EquipmentName' => $name,
        'EquipmentType' => $equipTypes[$index],
        'RequirementID' => $id2
    );
}

Quick Form Check #

Double-check your form field names to match your use case:

• For a single entry: Use name="txt_equipb" (no brackets)
• For multiple entries: Use name="txt_equipb[]" (brackets tell CodeIgniter to return an array instead of a single string)

内容的提问来源于stack exchange，提问作者Cedrix Cedrix