PHP / JavaScript：如何将数组从PHP传递到JavaScript

Question

I use the following PHP lines to convert some simpleXML data to an array:

$dataRaw = array();
foreach($objCount->escalations as $esc) {
    $dataRaw[(string)$esc->region] = (int)$esc->volume;
}
$dataPrep = json_decode(json_encode($dataRaw), TRUE);

Printing this returns the following which looks ok to me:

Array ( [af] => 6 [as] => 295 [eu] => 249 [na] => 279 [oc] => 42 [sa] => 10 ) 

I then tried to pass this in a JS function using the following line but this doesn't work. I am not getting any errors, the chart just doesnt show at all with this, probably because it doesn't recognise the content.

data: <?php echo $dataPrep;?>

When I hard-code the "data" values in JS as follows then everything works fine so I am probably passing it wrong.

var data = [{ 'hc-key': 'af', value: 6 },
    { 'hc-key': 'as', value: 295 },
    { 'hc-key': 'eu', value: 249 },
    { 'hc-key': 'na', value: 279 },
    { 'hc-key': 'oc', value: 42 },
    { 'hc-key': 'sa', value: 10 }];

Can some tell me what I have to change here ?

Many thanks in advance, Tim.

Answer 1

You need to pass the encoded data, not after decoding it. As after decoding, it change into array and directly we can not assign array to js variable:

foreach($objCount->escalations as $esc) {
    $dataRaw[(string)$esc->region] = (int)$esc->volume;
}
$dataPrep = json_encode($dataRaw);

and for js variable :

data: <?php echo $dataPrep;?>

Answer 2

data: <?php echo json_encode($dataPrep); ?>

PHP手册： json_encode() - http://www.php.net/manual/en/function.json-encode.php

Answer 3

Try this to get the desired structure:

foreach($objCount->escalations as $esc) {
    $dataRaw[] = array( 'hc-key' => (string) $esc->region, 'value' => (int) $esc->volume );
}

data: <?php echo json_encode( $dataRaw ); ?>

Answer 4

When you json_encode your data, you will have to parse it as json in javascript before you have an array again. Use for example: http://api.jquery.com/jquery.parsejson/

But in your case, you have already converted it back to a php array by calling json_decode. You cannot echo a php-array and expect it to show in the source like a javascript array.