The Generator class

(PHP 5 >= 5.5.0, PHP 7)

Introduction

Generator objects are returned from generators.

Caution

Generator objects cannot be instantiated via new.

Class synopsis

Generator implements Iterator {
/* Methods */
public mixed current ( void )
public mixed getReturn ( void )
public mixed key ( void )
public void next ( void )
public void rewind ( void )
public mixed send ( mixed $value )
public mixed throw ( Exception $exception )
public bool valid ( void )
public void __wakeup ( void )
}

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User Contributed Notes 2 notes

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1
Pistachio
8 days ago
Unlike return, yield can be used anywhere within a function so logic can flow more naturally. Take for example the following Fibonacci generator:

<?php
function fib($n)
{
   
$cur = 1;
   
$prev = 0;
    for (
$i = 0; $i < $n; $i++) {
       
yield $cur;

       
$temp = $cur;
       
$cur = $prev + $cur;
       
$prev = $temp;
    }
}

$fibs = fib(9);
foreach (
$fibs as $fib) {
    echo
" " . $fib;
}

// prints: 1 1 2 3 5 8 13 21 34
up
-112
dejiakala at gmail dot com
1 year ago
<?php

function sayHello($people) {
  foreach(
$people as $person) {
   
yield "hello " . $person;
  }
}

var_dump(sayHello(array('foo', 'bar', 'baz')));

?>

Output:

class Generator#1 (0) { 
}
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