sorting-examples.php

<?php


// fill array
$objects = [];
for($i = 0; $i < 100; ++$i) {
  $o = new stdClass;
  $o->val = $i * mt_rand() * 1000;
    $objects[] = $o;
}

echo 'Before:', PHP_EOL;
print_r($objects);

// php < 7
usort($objects, function($a, $b) {
  return $a->val < $b->val;
});

echo 'After:',PHP_EOL;
print_r($objects);

// php >= 7
usort($objects, function($a, $b) {
  return $a->val <=> $b->val;
});

// php 7.4, well... that got unreadable!
usort($objects, fn($a, $b) => $a->val <=> $b->val);