Question

I’m attempting to POST a JSON string that I grab from a MySql database to another php page. Here’s my code for the parent page:

$ResultLists = array();
$counter = 0;
echo "<form target=\"_blank\" enctype=\"multipart/form-data\" method=\"post\" action=\"_popup.php\" name=\"compare\">";

while($data != NULL and $info = mysql_fetch_array( $data ))
{ 
Print "<tr>";
//..
//I printed some data here, but not relevant to problem
//..
$ResultLists[$counter] = $info['ResultList']; //gets JSON string
echo gettype($ResultLists[$counter]); //prints "string"
//echo $ResultLists[$counter]; //prints the whole list (it is a list of lists <--from python)
$var = json_decode($ResultLists[$counter]); //decode JSON string
echo $var[1][0]; //prints wonderfully (I am only printing one value in "array", but it works).

Print '<td><input type="checkbox" name="data[]" value="'.$ResultLists[$counter].'" /></td>';
Print '</tr>';
$counter++;
}
echo '<tr><td><input type="hidden" name="index" value="'.$counter.'" />';
echo '<input type="submit" value ="Compare Data"> </input></td></tr>';

On the child page, I try to get the data:

<?php

$index = $_POST['index'];
echo 'Number of rows: '.$index.'<br>';
$array = $_POST['data'];

$x = 0;

//echo gettype($array);

echo '<b>Type:</b> '.gettype($array[$x]).'<b>  Length:</b> '.strlen($array[$x]).'  <b>Data:</b> '.$array[$x].'<br>';
$var = json_decode($array[$x]);
echo gettype($var).strlen($var);
echo $var[1][0];

?>

Which produces (for example)

Number of rows: 8
Type: string Length: 2 Data: [[
NULL0

So, it doesn’t work. (It does this for every row of data I have submitted, so varying $x results in same output as long as its in the range of number of checkboxes I selected, if that makes sense.) Any ideas? Why does it show up as “[[” instead of the entire list? I can print the whole list on parent page and it works fine.

I have a suspicion its due to the presence of single quote ” ‘ ” characters, or something. Any ideas?

Edit:

So disabling magic quotes seems to have helped me post.

However, I’m having a strange issue, where it somehow submits all my data.

So when I get back data[] via POST, the length is the correct number of checkboxes that were checked, but the data it holds starts from the first row that is printed. Any ideas?

Answer 1

You may probably want to escape the HTML characters in the json-ized string using htmlspecialchars. I.e.,

Print '<td><input type="checkbox" name="data[]" value="'.htmlspecialchars($ResultLists[$counter]).'" /></td>';