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The ksort Function

The ksort function sorts an array by keys in ascending order. The function modifies the array itself.

Syntax

phpksort(array &$array, int $flags = SORT_REGULAR): bool

Example

Let's sort an array by keys in ascending order:

php<?php
  $arr = [
    'b' => 1,
    'e' => 3,
    'c' => 2,
    'a' => 5,
    'd' => 4
  ];
  
  ksort($arr);
  var_dump($arr);
?>

Code execution result:

php[
  'a' => 5,
  'b' => 1,
  'c' => 2,
  'd' => 4
  'e' => 3,
]

See Also

the sort function,
which sorts by elements in ascending order
the rsort function,
which sorts by elements in descending order
the krsort function,
which sorts by keys in descending order
the asort function,
which sorts by elements in ascending order while preserving keys
the arsort function,
which sorts by elements in descending order while preserving keys
the natsort function,
which sorts using natural order
the natcasesort function,
which sorts using natural order case-insensitively
the usort function,
which sorts using a callback function
the uksort function,
which sorts by keys using a callback function
the uasort function,
which sorts using a callback function while preserving keys
the array_multisort function,
which sorts multiple arrays