Can't change value in array php

Question

{
    "available":18,
    "bind":0,
    "info":"",
    "hours_definitions":[
        {
            "value":"21:40"
        },
        {
            "value":"22:50"
        }
    ],
    "hours":{
        "21:40":{
            "available":1,
            "bind":0,
            "info":"",
            "notes":"",
            "price":3000,
            "promo":0,
            "status":"available"
        },
        "22:50":{
            "available":1,
            "bind":0,
            "info":"",
            "notes":"",
            "price":3000,
            "promo":0,
            "status":"available"
        }
    },
    "notes":"",
    "price":2000,
    "promo":0,
    "status":"available"
}

I have JSON array ($dataar), where I need to change "available" to 0 where "hours" array 21:40.

I am trying to use foreach:

$dataar1 = json_decode($dataar, true);
$dataar2 = $dataar1['hours'];
$hour = "21:40";
foreach ($dataar2 as $key => $entry) {
     if ($key == $hour) {
        $dataar2[$key]['available'] = 0;
    }
}

And I get $dataar2[$key]['available'] = 0, but when I am trying to json_encode it back, i see available:1 again.

How can I fix it?

Add the code you use to encode it back to JSON - I think you might not be encoding the correct variable. — mwotton
– mwotton, Commented Jan 21, 2015 at 23:04

Darren · Accepted Answer · 2015-01-21 23:07:10Z

4

You aren't changing the actual variable per-say, you're just assigning it to a new variable and changing that. This will work:

$dataar1 = json_decode($dataar, true);

foreach($dataar1['hours'] as $key => &$val) {
    if($key == '21:40') {
        $val['available'] = 0;
    }
}

^{The above example is using PHP's passing by-reference to modify the original array.}

Example

answered Jan 21, 2015 at 23:07

Darren

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Comments

Ian · Accepted Answer · 2015-01-21 22:59:00Z

1

You are only changing $dataar2, which is a new variable and no relation to the original. Try this instead:

$dataar1 = json_decode($dataar, true);
$hour = "21:40";
foreach ($dataar1['hours'] as $key => $entry) {
     if ($key == $hour) {
        $dataar1['hours'][$key]['available'] = 0;
    }
}
$dataar = json_encode($dataar1);

answered Jan 21, 2015 at 22:59

Ian

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