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So hi guys,

lets make this very clear. In php i used json_encode(...) and then got the value in javascript, looks as the following:

["float","float","float","float"]  // PS: This is a string...

And i would like to make this into a normal javascript array, like so:

Arr[0] // Will be float
Arr[1] // Will be float
Arr[2] // Will be float
Arr[3] // Will be float

And now I'm asking you, how is this possible?

Thank You

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if you passed the array back using json_encode() you have an array and you can index it by the method you showed... – scrappedcola Dec 21 '12 at 17:53
possible duplicate of Pass a PHP array to a JavaScript function – hotveryspicy Dec 22 '12 at 9:19

2 Answers

up vote 1 down vote accepted

It sounds like you're retrieving a JSON string in JavaScript (perhaps via AJAX?). If you need to make this into an actual array value, you'd probably want to use JSON.parse().

var retrievedJSON = '["float","float","float","float"]'; // normally from AJAX
var myArray = JSON.parse(retrievedJSON);

If you're actually writing out a value into the page, rather than using AJAX, then you should be able to simply echo the output of json_encode directly, without quoting; JSON itself is valid JavaScript.

var myArray = <?php echo json_encode($myPhpArray); ?>;
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up vote 2 down vote 
var myArray = <?= json_encode($myPhpArray); ?>;

Pretty simple. ;-)

Example:

<?php
  $myPhpArray = array('foo', 'bar', 'baz');
?>
<script type="text/javascript">
  var myJsArray = <?= json_encode($myPhpArray); ?>;
</script>

Should output (view-source):

<script type="javascript">
  var myJsArray = ["foo","bar","baz"];
</script>

Example

share|improve this answer
And that gives me the javascript array? – Miguel P Dec 21 '12 at 17:51
yes. it's taking an PHP variable and converting in to JSON which javascript will be able to parse and store. – Brad Christie Dec 21 '12 at 17:52
1  
As an explanation it might be helpful to note that JSON (JavaScript Object Notation) is a subset of the JavaScript language and so can be parsed successfully by any JavaScript interpreter. – dualed Dec 21 '12 at 17:58
Indeed, JSON!=JavaScript, it's just a serialized representation of data that JavaScript (and many other languages) can translate. – Brad Christie Dec 21 '12 at 18:00

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