Find the word in a sentence with maximum specific character count - php

Question

I am new to PHP Development and finally with the help of SO I am able to write a program for finding word in a sentence with maximum specific character count.
Below is what I have tried:
<?php
// Program to find the word in a sentence with maximum specific character count
// Example: "O Romeo, Romeo, wherefore art thou Romeo?”
// Solution: wherefore
// Explanation: Because "e" came three times
$content = file_get_contents($argv[1]); // Reading content of file
$max = 0;
$arr = explode(" ", $content); // entire array of strings with file contents
for($x =0; $x<count($arr); $x++) // looping through entire array
{
$array[$x] = str_split($arr[$x]); // converting each of the string into array
}
for($x = 0; $x < count($arr); $x++)
{
$count = array_count_values($array[$x]);
$curr_max = max($count);
if($curr_max > $max)
{
$max = $curr_max;
$word = $arr[$x];
}
}
echo $word;
?>
Question: Since I am new to PHP development I don't know the optimization techniques. Is there anyway I can optimize this code? Also, Can I use regex to optimize this code further? Kindly guide.

Answer 1

I love coding this type of mini-challenges in the minimum lines of code :D. So here is my solution:
function wordsWithMaxCharFrequency($sentence) {
$words = preg_split('/\s+/', $sentence);
$maxCharsFrequency = array_map (function($word) {
return max(count_chars(strtolower($word)));
}, $words);
return array_map(function($index) use($words) {
return $words[$index];
}, array_keys($maxCharsFrequency, max($maxCharsFrequency)));
}
print_r(wordsWithMaxCharFrequency("eeee yyyy"));
//Output: Array ( [0] => eeee [1] => yyyy )
print_r(wordsWithMaxCharFrequency("xx llll x"));
//Output: Array ( [0] => llll )
Update1:
If you want to get only A-Za-z words use the following code:
$matches = [];
//a word is either followed by a space or end of input
preg_match_all('/([a-z]+)(?=\s|$)/i', $sentence, $matches);
$words = $matches[1];
Just a contribution that could inspire you :D!
Good Luck.