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@ 2018-09-07T01:13:09Z

<?php

$array = [[
    2 => 9.6
], [
    497 => 11.666666666667
], [
    451 => 34
], [
    459 => 8.8
], [
    461 => 22.5
]];

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

usort($array, function($a, $b) {
    return reset($b) <=> reset($a);
});

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

Output
Performance
VLD
References
Branches

reset: documentation ( source)
print_r: documentation ( source)
usort: documentation ( source)

preferences:dark modelive previewkey bindings

145.06 ms | 406 KiB | 5 Q