これがあなたが望むものです:
<?php
//create an array with words, similar to what you get with file()
$str = "here is a list of random words that will be sorted";
$array = explode(" ", $str);
//a place to store the result
$result = array();
//check each value
foreach($array as $word) {
//str_split will create an array from a string
$letters = str_split(trim($word));
//sort the letters
sort($letters);
//implode the letters again to a single word
$sorted = implode($letters);
//add to result
$result[$sorted] = $word;
}
//dump
var_dump($result);
//sort on the key
ksort($result);
//dump
var_dump($result);
?>
これは出力されます
//unsorted
array(11) {
["eehr"]=>
string(4) "here"
["is"]=>
string(2) "is"
["a"]=>
string(1) "a"
["ilst"]=>
string(4) "list"
["fo"]=>
string(2) "of"
["admnor"]=>
string(6) "random"
["dorsw"]=>
string(5) "words"
["ahtt"]=>
string(4) "that"
["illw"]=>
string(4) "will"
["be"]=>
string(2) "be"
["deorst"]=>
string(6) "sorted"
}
//sorted on key
array(11) {
["a"]=>
string(1) "a"
["admnor"]=>
string(6) "random"
["ahtt"]=>
string(4) "that"
["be"]=>
string(2) "be"
["deorst"]=>
string(6) "sorted"
["dorsw"]=>
string(5) "words"
["eehr"]=>
string(4) "here"
["fo"]=>
string(2) "of"
["illw"]=>
string(4) "will"
["ilst"]=>
string(4) "list"
["is"]=>
string(2) "is"
}