PHP VERSION: 7.0.20

generator_return_expressions.php

<?php

// generator which yields all the words out of a text file
function getWords($file) {
    
$obj   = new SplFileObject($file'r');
    
$count 0;
    
$word  '';
    while (!
$obj->eof()) {
        
$c $obj->fgetc();
        if (
ctype_alpha($c)) {
            
$word .= $c;
        } elseif (
$word) {
            yield 
$word;
            
$word '';
            
$count++;
        }
    }
    return 
$count;
}

$filename     __DIR__ '/gettysburg.txt';
$gettysBurg   getWords($filename);
var_dump($gettysBurg);

$wordsPerLine 20;
$pos          1;
foreach (
$gettysBurg as $word) {
    echo 
$word ' ';
    if (
$pos++ % $wordsPerLine == 0) {
        echo 
PHP_EOL;
    }
}
echo 
PHP_EOL 'Count: ' $gettysBurg->getReturn();
        

Output


object(Generator)#1 (0) {
}
Four score and seven years ago our fathers brought forth on this continent a new nation conceived in liberty and 
dedicated to the proposition that all men are created equal Now we are engaged in a great civil war testing 
whether that nation or any nation so conceived and so dedicated can long endure We are met on a great 
battlefield of that war We have come to dedicate a portion of that field as a final resting place for 
those who here gave their lives that that nation might live It is altogether fitting and proper that we should 
do this But in a larger sense we can not dedicate we can not consecrate we can not hallow this 
ground The brave men living and dead who struggled here have consecrated it far above our poor power to add 
or detract The world will little note nor long remember what we say here but it can never forget what 
they did here It is for us the living rather to be dedicated here to the unfinished work which they 
who fought here have thus far so nobly advanced It is rather for us to be here dedicated to the 
great task remaining before us that from these honored dead we take increased devotion to that cause for which they 
gave the last full measure of devotion that we here highly resolve that these dead shall not have died in 
vain that this nation under God shall have a new birth of freedom and that government of the people by 
the people for the people shall not perish from the earth 
Count: 271
SOURCE CODE