Array Sorting & Filtering

Sorting Functions

sort()      // sort values (re-indexes)
rsort()     // reverse sort values
asort()     // sort values (keeps keys)
arsort()    // reverse sort values (keeps keys)
ksort()     // sort by keys
krsort()    // reverse sort by keys
usort()     // sort with custom comparator
uasort()    // sort with keys using comparator
uksort()    // sort by keys using comparator
natsort()   // natural order sorting
array_multisort() // multi-dimensional sort

Custom Sorting

\$users = [
    ["name" => "Bob", "age" => 25],
    ["name" => "Alice", "age" => 30],
];
usort(\$users, fn(\$a, \$b) => \$a["age"] <=> \$b["age"]);
// Spaceship operator (<=>) returns -1, 0, or 1