CODEWITHSUNDEEP
phpreturnusort
Thomas E.
Thomas E.

Reputation: 551

Dealing with equal numbers in usort PHP

I am trying to get PHP to compare two values and sort them using usort(). I have this function, which works, however this function stops running if $a == $b,

Having this function stop running prevents further functions in the PHP file to run.

<?php
function cmp($a, $b) {
    if ($a[4] == $b[4]) {
        return 0;
    }
    return ($a[4] < $b[4]) ? -1 : 1;
}
usort($participants_times,"cmp");
?>

When there are two values that are equal, I don't mind which one is in front of the other. I have tried setting return -1, return 0, and return 1 when $a == $b but they didnt work for me.

Any help is appreciated :)

Upvotes: 1

Views: 190

Answers (3)

Thomas E.
Thomas E.

Reputation: 551

So the answers provided are very likely correct to my question - however, in my case, the issue was related to the form of my function()'s where I had a function inside a function and a second iteration of the initial function failed.

Moving my cmp() function outside of the function that calls it solved my issue.

Upvotes: 0

Hieu Vo
Hieu Vo

Reputation: 3284

because you don't care the equal case, just ignore it

function cmp($a, $b) {
    return ($a[4] < $b[4]) ? -1 : 1;
}

usort($participants_times,"cmp");

Upvotes: 0

Indrasis Datta
Indrasis Datta

Reputation: 8606

You should replace ternary operator with nested if-else statements. In your condition, it returns 1 for both > and == comparison.

if ($a[4] < $b[4])
    return -1;
else if ($a[4] > $b[4]) 
    return 1;
else
    return 0;

Upvotes: 1

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