The meaning of PHP Notice and how to reproduce it:

If you pass a PHP array to a function that expects a string, such asechoorprint, then the PHP interpreter will convert your array to a literal stringArray, throw this Notice and continue execution. For example:

php> print(array(1,2,3)) PHP Notice: Array to string conversion in /usr/local/lib/python2.7/dist-packages/phpsh/phpsh.php(591) : eval()'d code on line 1 Array

In this case, the functionprintoutputs the literal stringArrayto stdout, then logs the Notice to stderr and continues execution.

Another PHP script example:

Correction method 1: Use foreach loop to access array elements

http://php.net/foreach

$stuff = array(1,2,3); foreach ($stuff as $value) { echo $value, "\n"; }

Output:

1 2 3

Or contain array key name:

$stuff = array('name' => 'Joe', 'email' => 'joe@example.com'); foreach ($stuff as $key => $value) { echo "$key: $value\n"; }

Output:

name: Joe email: joe@example.com

Note that array elements can also be arrays. In this case, you can useforeachagain or use array syntax to access the inner array elements, like$row['name']

Correction method 2: Connect all cells in the array together:

If it is just an ordinary one-dimensional array, you can use the delimiter to concatenate all cells into a string:

          
Correction method 3: Convert array of complex structure to string:
          
If your array has a complex structure but still need to convert it to a string, you can usehttp://php.net/json_encode
          
$stuff = array('name' => 'Joe', 'email' => 'joe@example.com'); print json_encode($stuff);
          
Output:
          
{"name":"Joe","email":"joe@example.com"}
          
Quickly view the array structure: use the built-in php function
          
If you just want to inspect the array contents for debugging purposes, you can use one of the following functions. Keep in mind that var_dump is the most verbose of them all and is usually preferred for this purpose
          

           
http://php.net/print_r
           
http://php.net/var_dump
           
http://php.net/var_export
          
          
Example:
          
$stuff = array(1,2,3); print_r($stuff); $stuff = array(3,4,5); var_dump($stuff);
          
Output:
          
Array ( [0] => 1 [1] => 2 [2] => 3 ) array(3) { [0]=> int(3) [1]=> int(4) [2]=> int(5) }
         

When you have a lot of HTML input namedC[], what you get on the other end of the POST array is an array of those values$_POST['C']. So when youechoit, you are trying to print an array, so it will just printArrayand a hint.

To properly print an array, you can loop through it andechoeach element, or you can useprint_r.

Also, if you don't know if it's an array or a string or whatever, you can usevar_dump($var)and it will tell you what type it is and what its contents are . For debugging purposes only.