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up vote 18 down vote favorite
13

I am trying to get a PHP array variable into a JavaScript variable.

This is my code:

<html>
    <head>
        <script type="text/javascript">
              function drawChart(row,day,week,month,date)
              {
                  // Some code...
              }
        </script>
    </head>

    <body>
        <?php
            for($counter = 0; $counter<count($au); $counter++)
            {
                switch($au[$counter]->id)
                {
                    case pageID.'/insights/page_active_users/day':
                        $day[] = $au[$counter]->value;
                    break;
                    case pageID.'/insights/page_active_users/week':
                        $week[] = $au[$counter]->value;
                    break;
                    case pageID.'/insights/page_active_users/month':
                        $month[] = $au[$counter]->value;
                    break;
                }
            }
        ?>
        <script>
            drawChart(600/50, '<?php echo $day; ?>', '<?php echo $week; ?>', '<?php echo $month; ?>', '<?php echo createDatesArray(cal_days_in_month(CAL_GREGORIAN, date('m',strtotime('-1 day')), date('Y',strtotime('-1 day')))); ?>');
        </script>
    </body>
</html>

I can't get value of the PHP array.

How do I fix this problem?

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4 Answers

up vote 43 down vote

Use JSON.

In the following example $php_variable can be any PHP variable.

<script type="text/javascript">
    var obj = <?php echo json_encode($php_variable); ?>;
</script>

In your code, you could use like the following:

drawChart(600/50, <?php echo json_encode($day); ?>, ...)

In cases where you need to parse out an object from JSON-string (like in an AJAX request), the safe way is to use JSON.parse(..) like the below:

var s = "<JSON-String>";
var obj = JSON.parse(s);
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What would be the disadvantage of simply writing var obj = <?php echo json_encode($php_variable); ?>;? Won't PHP encode the JSON object securely in a way that it's parsable by the script? – YMMD May 4 '12 at 14:43
Yes, that is the way. But my intention was to put across JSON.parse() as one safe way to parse from string. Thanks for pointing, I will edit my post. – Thrustmaster May 5 '12 at 17:41
up vote 3 down vote accepted

In the following example you have an PHP array, then firstly create a JavaScript array by a PHP array:

<script type="javascript">
    day = new Array(<?php echo implode(',', $day); ?>);
    week = new Array(<?php echo implode(',',$week); ?>);
    month = new Array(<?php echo implode(',',$month); ?>);

    <!--  Then pass it to the JavaScript function:   -->

    drawChart(<?php echo count($day); ?>, day, week, month);
</script>
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up vote 2 down vote

you can convert php arrays into javascript using php's json_encode()* function

<?php $phpArray = array(
          0 => "Mon", 
          1 => "Tue", 
          2 => "Wed", 
          3 => "Thu",
          4 => "Fri", 
          5 => "Sat",
          6 => "Sun",

    )
?>

<script type="text/javascript">

    var jArray= <?php echo json_encode($phpArray ); ?>;

    for(var i=0;i<6;i++){
        alert(jArray[i]);
    }

 </script>
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up vote -6 down vote 
example('<?=$phpvar1?>','<?=$phpvar2?>' );

<script>
function example(val,val2){
     //code
} 
</script>

try this ??

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