Question2

2.php

<?php
/*
* File data:
*	aaa jkj dfd qwerty
*	fff aaa bbb qwerty
*	jkj dfd bbb
*	aaa aaa aaa qwerty
*
* Usage: php 2.php data.txt
*
* Output:
*	5 aaa
*	2 bbb
*	2 dfd
*	1 fff
*	2 jkj
*	3 qwerty
*
*/


//ensure that a file name was given
if(empty($argv[1])){
	echo 'Please pass a file as first param.'.PHP_EOL;
	exit;
}

//store file name
$strFile = $argv[1];

//create array to hold words
$arrWords = [];

//read the file
$resFP = fopen($strFile, 'r');
while($strLine = stream_get_line($resFP, 1024 * 1024, "\n")){
	//loop through each line and break into individual words
	foreach(explode(' ', $strLine) as $strWord){
		//trim the words to clean up input
		$strWord = trim($strWord);
		if($strWord){
			if(isset($arrWords[$strWord])){
				//increment count
				$arrWords[$strWord]++;
			}else{
				//create first record of word
				$arrWords[$strWord] = 1;
			}
		}
	}
}
fclose($resFP);

//sort array into alphabetical order
ksort($arrWords);

//print results
foreach($arrWords as $strWord => $numCount){
	echo $numCount.' '.$strWord.PHP_EOL;
}

data.txt

aaa jkj dfd qwerty 
fff aaa bbb qwerty 
jkj dfd bbb 
aaa aaa aaa qwerty