PHP custom function for array sorting wth usort not working

Question

I'm working on a magento site php code and trying to sort array using label ASC. so the values should be sort by label.

I used usort function for that

but even i use function output can't see any differences.

Ex-

        //$info has the array values 
/*which assigned like this 
 $info['options'][] = array(
                        'id'        => $value['value_index'],
                        'label'     => $value['label'],
                        'price'     => $configurablePrice,
                        'oldPrice'  => $this->_prepareOldPrice($value['pricing_value'], $value['is_percent']),
                        'products'  => $productsIndex,
                    );

*/

Sort function is below

 usort($info['options'], function ($a,$b){
                            return strcmp($a['label'],$b['label']);
                        }
                    ); 
var_dump($info);

even i sort or not array shows this output

  var spConfig = new Product.Config(array(10) {
      [0]=>
      array(5) {
        ["id"]=>
        string(5) "46050"
        ["label"]=>
        string(3) "110"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95331"
        }
      }
      [1]=>
      array(5) {
        ["id"]=>
        string(5) "46071"
        ["label"]=>
        string(3) "120"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95332"
        }
      }
      [2]=>
      array(5) {
        ["id"]=>
        string(5) "46086"
        ["label"]=>
        string(3) "130"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95333"
        }
      }
      [3]=>
      array(5) {
        ["id"]=>
        string(5) "46112"
        ["label"]=>
        string(3) "140"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95334"
        }
      }          
      [4]=>
      array(5)
      [6]=>
      array(5) {
        ["id"]=>
        string(5) "46455"
        ["label"]=>
        string(2) "60"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95326"
        }
      }
      [5]=>
      array(5) {
        ["id"]=>
        string(5) "46494"
        ["label"]=>
        string(2) "70"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95327"
        }
      }
      [5]=>
      array(5) {
        ["id"]=>
        string(5) "46527"
        ["label"]=>
        string(2) "80"
        ["price"]=>
        string(1) "0"
        ["oldPrice"]=>
        string(1) "0"
        ["products"]=>
        array(1) {
          [0]=>
          string(5) "95328"
        }
      }  
      
    }

I tried few other array keys too but non of them not worked, Anyone can help me to sort this, Thank You

String to integer casting is not necessary with the spaceship operator. Answers on this page do not advise best practices. This page can safely be removed from Stack Overflow. — mickmackusa, Apr 14 '22 at 21:53

score 1 · Accepted Answer · answered Dec 17 '20 at 14:07

1

Try converting them to integers because a string compare is very different from integer compare. For example, 2 comes lexicographically after than 100, but that's not what you want.

usort ($info['options'], function ($a,$b) {
        $la = intval($a['label']);
        $lb = intval($b['label']);
        if ($la < $lb) return -1;
        if ($la > $lb) return 1;
        return 0;
    }
);

As of PHP 7, you can directly use the spaceship operator,

usort ($info['options'], function ($a,$b) {
        return intval($a['label']) <=> intval($b['label']);
    }
);

answered Dec 17 '20 at 14:07

nice_dev

17,053
2
21
35

1

Thanks, you saved lots of my time, it seems works fine, I'll run some more tests – Suneth Kalhara Dec 17 '20 at 15:21
`intval()` calls are not necessary with the spaceship operator because it will treat numeric values as numbers (properly). – mickmackusa Apr 14 '22 at 21:42

score 0 · Answer 2 · answered Dec 17 '20 at 14:07

0

change the first parameter of your usort implementation from this...

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

To this...

usort($info['options'], function ($a,$b){
    return strcmp($a['label'],$b['label']);
}

You were just using the wrong level of the array to sort on.

answered Dec 17 '20 at 14:07

Simon K

1,503
1
8
10

sorry i had to edit question little, i tried above solution before but not worked – Suneth Kalhara Dec 17 '20 at 15:20
This answer is simply and provably incorrect. Proof: https://3v4l.org/ZP7rb Researchers must not follow the advice in this answer. – mickmackusa Apr 14 '22 at 21:46

PHP custom function for array sorting wth usort not working

2 Answers2