PHP Order Second Array ASC by Key

Question

I have an array inside an array that has the filename, modification time and size, but I need to be able to order the array either ascending or descending by each one of these properties.

I have the following, which gets the information

//SCAN THE DIRECTORY
$directories = scandir($dir);
$directinfo = array();
foreach($directories as $directory){
    if ($directory === '.' or $directory === '..') continue;
    if(!stat($dir.'/'.$directory)){

    } else {
        $filestat = stat($dir.'/'.$directory);
        $directinfo[] = array(
            'name' => $directory,
            'modtime' => $filestat['mtime'],
            'size' => $filestat['size']
        );
    }
}

The array is structured as so:

Array ( 
    [0] => Array ( 
        [name] => 0 Organisation Details 
        [modtime] => 1398164749 
        [size] => 4096
    ) 
    [1] => Array ( 
        [name] => 1 Permission Form 
        [modtime] => 1398164749 
        [size] => 4096 
    ) 
    [2] => Array ( 
        [name] => 6 Invoices 
        [modtime] => 1400802471 
        [size] => 4096 
    ) 
)

and then use this to output:

foreach($directinfo as $dirInfo){
    foreach($dirInfo as $key=>$drInfo){
        echo "Output: ".$key."=>".$drInfo."<br />";
    }
}

But I need to arrange the array before this, and somehow make it so I don't need two arrays or I'm suspecting the ordered output wouldn't work.

I've looked at array_multisort but can't figure out how this would work in this instance.

Any help with this is really appreciated.

There's a great table in the manual describing which sorting function will be suitable for which scenario. Otherwise, can you provide an example of your array structure? — scrowler
– scrowler, Commented Jul 13, 2014 at 21:58
You can save one call to stat with if (!($filestat = stat ...)) { } else { $directinfo[] = .... — LSerni
– LSerni, Commented Jul 13, 2014 at 22:12

Steve · Accepted Answer · 2014-07-13 22:08:16Z

1

You can use usort:

usort($arr, function($a,$b){
    return strcmp($a['name'], $b['name']);
});

var_dump($arr);

http://codepad.viper-7.com/lZoUsO

answered Jul 13, 2014 at 22:08

Steve

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3 Comments

Seán McCabe Over a year ago

Not sure how this helps, as that assumes I have one array, whereas I have an array inside an array. So how would I use this, given the data I've provided?

scrowler Over a year ago

@SeanMcCabe you haven't actually provided any data, it would definitely help if you did

Steve Over a year ago

@SeánMcCabe Please check the fiddle - it is working exactly how you require. $a and $b are elements of the array, themselves being individual arrays. The array $arr is sorted on the name elements of the internal arrays

cOle2 · Accepted Answer · 2014-07-13 22:45:54Z

0

Using example #3 on the array_multisort manual page:

$directories = array( 
array('name'=>'filec','modtime'=>'12303403434','size'=>'12401'),
array('name'=>'fileb','modtime'=>'12303403432','size'=>'12400'), 
array('name'=>'filez', 'modtime'=>'12304445405','size'=>'65200')
);

// Obtain a list of columns
$name = $modtime = $size = array();
foreach ($directories as $key => $row) {
    $name[$key]  = $row['name'];
    $modtime[$key] = $row['modtime'];
    $size[$key] = $row['size'];
}

// Sort the data with name ascending, modtime ascending, size ascending
array_multisort($name, SORT_ASC, $modtime, SORT_ASC, $size, SORT_ASC, $directories);

print_r($directories);

Online demo here

edited Jul 13, 2014 at 22:45

answered Jul 13, 2014 at 22:39

cOle2

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1 Comment

Seán McCabe Over a year ago

Thank you @cOle2 its worked perfectly. I had come across this before but couldnt get it working, but it is now.

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