爲什麼在此代碼中出現錯誤'Illegal offset type'？

Question

爲什麼我會在$errors[$field] .= '<div class="error"><p>' . $error . '</p></div>';這行上的代碼中得到'Illegal offset type'錯誤？

代碼：

$errors = []; 
foreach ($validation->errors() as $field) 
{ 
    $errors[$field] = ''; 
    foreach ($field as $error) { 
     $errors[$field] .= '<div class="error"><p>' . $error . '</p></div>'; 
    } 
} 

驗證：

private function addError($field, $error) 
{ 
    $this->errors[$field][] = $error; 
} 

public function errors() 
{ 
    return $this->errors; 
} 

解決方案：

foreach ($validation->errors() as $key => $fieldErrors) 
{ 
    $errors[$key] = ''; 
    foreach ($fieldErrors as $error) { 
     $errors[$key] .= '<div class="error"><p>' . $error . '</p></div>'; 
    } 
} 

Answer 1

foreach ($field as $error) 

這條線表明，$field是一個數組。您不能將數組用作另一個數組的鍵。

$errors[$field] << won't work! 

要修正，更改addError方法：

private function addError($field, $error) 
{ 
    $this->errors[$field] .= $error; //I changed [$field][] to [$field] 
}