Sorting grouped multi-dimensional array by value

Question

$data = array(
    'apple' => array(
        0 => array('sort'=>4, 'name'=>'apple_4'),
        1 => array('sort'=>10, 'name'=>'apple_10'),
        2 => array('sort'=>5, 'name'=>'apple_5'),
        3 => array('sort'=>1, 'name'=>'apple_1')
        ),

    'orange' => array(
        0 => array('sort'=>4, 'name'=>'orange_4'),
        1 => array('sort'=>10, 'name'=>'orange_10')
        )
    );

Need assistance sorting multi-dimensional array. For the array above, I would like to sort the contents of each group in descending order by the 'sort' value. The group's keys should remain in tact (apple, orange) but content's keys are not important.

Data should be ordered:

apple
- apple_10
- apple_5
- apple_4
- apple_1
orange
- orange_10
- orange_4

possible duplicate of Reference: all basic ways to sort arrays and data in PHP — baao
– baao, Commented Aug 1, 2015 at 0:57

Rizier123 · Accepted Answer · 2015-08-01 01:04:14Z

1

Use usort() to sort the array:

foreach($data as &$value) {
    usort($value,function($a,$b) {
        return $b['sort'] - $a['sort'];
    });
}

edited Aug 1, 2015 at 1:04

Rizier123

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answered Aug 1, 2015 at 0:48

FuzzyTree

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2 Comments

FuzzyTree Over a year ago

@LouisW if the field you're sorting by isn't a string, you should use the updated code

Rizier123 Over a year ago

^^ Will remove the other comments, since everything is cleared. (An alternative to the foreach loop to add this here would be to use array_walk(), e.g. array_walk($data, function(&$value){/* usort() here */})

Absalon Valdes · Accepted Answer · 2015-08-01 00:57:03Z

$data = array(                                                                  
    'apple' => array(                                                           
        0 => array('sort'=>4, 'name'=>'apple_4'),                               
        1 => array('sort'=>10, 'name'=>'apple_10'),                             
        2 => array('sort'=>5, 'name'=>'apple_5'),                               
        3 => array('sort'=>1, 'name'=>'apple_1')                                
    ),                                                                          

    'orange' => array(                                                          
        0 => array('sort'=>4, 'name'=>'orange_4'),                              
        1 => array('sort'=>10, 'name'=>'orange_10')                             
    )                                                                           
);                                                                              

foreach($data as &$value) {                                                        
    usort($value, function($a, $b) {                                            
        return $a['sort'] < $b['sort'];                                         
    });                                                                                                                                       
}

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