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I have a bunch of parallel arrays in php

$phoneNums = array();
$minutesUsed = array();
$plans = array();
$charges = array();

and I'm trying to put them in arrays in JS so I can access them and print values into the page

var phoneNums = <?php echo $phoneNums ?>;
var minutesUsed = <?php echo $minutesUsed ?>;
var plans = <?php echo $plans ?>;
var charge = <?php echo $charges ?>;

What ends up happening is my values end up as undefined. How would I pass an array from php to js this without using AJAX or JQuery?

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1 Answer

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Echoing a PHP array will not print its contents. Even if it would, it would not be in the same format that Javascript expects ([1,2,3]) - also, associative arrays in PHP work quite differently than JS, where they are objects ({'x':1,'y':2}).

JSON is Javascript Object Notation. If you encode your data in JSON (in PHP, you can use json_encode() to do that), it will be absolutely acceptable for Javascript, so you can simply print it:

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

Demo

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Uncaught Syntax Error: Unexpected end of input. – ArcaneExplosion May 6 '12 at 21:06
@ArcaneExplosion My mistake, check now. – bažmegakapa May 6 '12 at 21:06
hmm this time nothing prints out unlike before where it was just undefined. and it comes up as an empty array in the error console – ArcaneExplosion May 6 '12 at 21:12
@ArcaneExplosion I have added a Demo that shows it working. Are you sure you have an array with that name in that variable scope? – bažmegakapa May 6 '12 at 21:13
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I left out the parts where i populated the array. I figured out the issue was my JS ran before the function call to populate the arrays. My mistake – ArcaneExplosion May 6 '12 at 21:20
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