how to sort lines of file.txt according to str len - php

i want to sort a file.txt according to string len

sample file.txt :

wew
12dde
12swsw
11
swsw
a

ofter 开发者_如何学运维sort file sorted.txt :

a
11
wew
swsw
12dde
12swsw

$string = <<<EOT
wew
12dde
12swsw
11
swsw
a
EOT;

$array = explode("\n", $string);

usort($array, function($a, $b) { return strlen($a) - strlen($b); });

var_dump($array);

Output:

array(6) {
  [0]=>
  string(1) "a"
  [1]=>
  string(3) "11"
  [2]=>
  string(4) "wew"
  [3]=>
  string(5) "swsw"
  [4]=>
  string(6) "12dde"
  [5]=>
  string(7) "12swsw"
}

This should do what you need:

<?php
function lensort($a, $b) {
    return strlen($a) - strlen($b);
}

$path1 = '/root/oldfile.txt';
$path2 = '/root/newfile.txt';
file_put_contents($path2, usort(file($path1), 'lensort'));