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Sorting an Array Using a Method Instead of a Function in PHP
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Sorting an Array Using a Method Instead of a Function in PHP

InfinityCoder November 20, 2016

You want to define a custom sorting routine to order an array. However, instead of using a function, you want to use an object method.

Pass in an array holding a class name and method in place of the function name:

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usort($access_times, array('dates', 'compare'));

As with a custom sort function, the object method needs to take two input arguments and return 1, 0, or −1, depending on whether the first parameter is larger than, equal to, or less than the second:

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class sort {
   // reverse-order string comparison
   static function strrcmp($a, $b) {
       return strcmp($b, $a);
   }
}
 
usort($words, array('sort', 'strrcmp'));

It must also be declared as static. Alternatively, you can use an instantiated object:

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class Dates {
    public function compare($a, $b) { /* compare here */ }
}
 
$dates = new Dates;
 
usort($access_times, array($dates, 'compare'));

 

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