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I have a problem to get in a session array from php into a javascript

I´m setting the sessions array here, the print_r is only for checking so it´s correct

  while($row2[]=mysql_fetch_array($result2))
    $_SESSION['row2'] = $row2; 
  print_r($_SESSION['row2'][0][0]);
  print_r($_SESSION['row2'][0][1]);
  print_r($_SESSION['row2'][0][2]);

and in my javascript i use this, alert is only for checking

 var row2 =<?php echo json_encode($_SESSION['row2']) ?>;
 alert (row2[0][0]);
 alert (row2[0][1]);
 alert (row2[0][2]);

row2[0][0] and row2[0][1], works fine, I get the numbers from the array but row2[0][2] give me the value null, it should be some text in this field, it´s works fine with print_r($_SESSION['row2'][0][2]); in the php-code.

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Can you view source in your browser and see what does var row2 = ... become? (actually, see the JSON on the javascript side) –  Yaniro Apr 10 '12 at 13:56
 
{"0":"27","chapterNumber":"27","1":"0","number":"0","2":null,"nameOfTask":null} –  Mats Gustavsson Apr 10 '12 at 14:00
 
Well, from this output it's clear as rain, index 2 is in fact null. If echoing $row2[ 0 ][ 2 ] prints a value, then the problem is either when inserting the value & then extracting it from the $_SESSION collection or with json_encode(), what is the value which should appear for $row[ 0 ][ 2 ]? –  Yaniro Apr 10 '12 at 14:12
 
the value for $row[0][2] is "Rätt eller fel!" And I have discovered why it´s beeing null, it´s when I use swedish charactar å,ä,ö. When not using them it´s work!!! –  Mats Gustavsson Apr 10 '12 at 14:31
 
Is it a new question how to solve this by using swedish charactar or should i update this question, I´m new here. And I need to use the swedish charactar!!! –  Mats Gustavsson Apr 10 '12 at 14:36

3 Answers

up vote 1 down vote accepted

use firebug console or chrome console. After that dump the entire row2 into the console and preview the data.

// JavaScript
var row2 =<?php echo json_encode($_SESSION['row2']) ?>;
console.debug(row2);

Also, keep in mind that all PHP associative arrays will become JSON object and should be accessed with .

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Thanx it helped me a lot, I found the problem, it´s when I use swedish charactar å,ä,ö. When not using them it´s work!!! –  Mats Gustavsson Apr 10 '12 at 14:32
up vote 0 down vote

You have to encode the Array, but keep in mind the result is a string, so you have to enclose it with single quotes and then parse it into an object:

var row2 = '<?php echo json_encode($_SESSION['row2']) ?>';
row2 = JSON.parse(row2);
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gives the same result as before –  Mats Gustavsson Apr 10 '12 at 14:11
up vote 0 down vote

As Alex stated, if you have an associative array into PHP, the json_encode output won't be the same.

Is it possible that it's the problem? As you seem not to use the associative keys, you may avoid to use mysql_fetch_array and could try mysql_fetch_row instead.

(Nb: your code is weird)

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I have just finished a course in PHP and this is my first "work", I`ve never used JSON before I saw it on an other question here, I have to study that more. I don´t know if it´s the best way to get an PHP session array into javascript. –  Mats Gustavsson Apr 10 '12 at 14:15

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