Php get last array key

Question

I'm using this code to generate JSON string, but a faced with one problem, I try to find out is this the last element or not, I am using this if(end($aData) != $aD) but this is comparing the value, there is a problem, when in the array are same values, How could I compare the $keys(get the last key and compare with the current key), or get the last element.

$ret    =   '[';
        foreach($aDatas as $aData)
        {
            $ret    .=  "{";
            foreach($aData as $key=>$aD)
            {               
                $ret    .=  '"'.$key.'":"'.$aD.'"';
                if(end($aData) != $aD)
                    $ret    .=  ',';
            }
            $ret    .=  "}";
            if(end($aDatas) != $aData)
                $ret    .=  ',';
        }
        echo $ret.']';

This doesn't look like it does anything special. Why don't you use the native json_encode? — mario
– mario, Commented Mar 24, 2011 at 11:30
because I didn't know this function, but now I know, thanks. — Mokus
– Mokus, Commented Mar 24, 2011 at 12:01

mauris · Accepted Answer · 2011-03-24 11:32:49Z

7

May I suggest this PHP built-in function json_encode()?

Might save you a lot of time.

edited Mar 24, 2011 at 11:32

mauris

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answered Mar 24, 2011 at 11:31

sharpner

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Comments

Saul · Accepted Answer · 2011-03-24 11:29:15Z

3

One option would be to use the key() function:

end($aData);
if(key($aData) != $key)

answered Mar 24, 2011 at 11:29

Saul

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3 Comments

Ignacio Vazquez-Abrams Over a year ago

end() will move the array's internal pointer. Besides, array_merge(array(1,2,1), array('foo','bar','quux')).

Mokus Over a year ago

I had tried, but I got the following error: key() expects parameter 1 to be array, string given in

ThiefMaster Over a year ago

That would return the key of the last value of $aData or throw an error if that array element is no array.

ThiefMaster · Accepted Answer · 2011-03-24 11:31:01Z

1

You know the size of the array. So simply increase a counter in every loop and then check if it's the last element.

answered Mar 24, 2011 at 11:31

ThiefMaster

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