php_simple_generator.md

A generator allows you to write code that uses foreach to iterate over a set of data without needing to build an array in memory, which may cause you to exceed a memory limit, or require a considerable amount of processing time to generate.

Example

<?php

/**
 * Helper function to get $count of even numbers.
 */
function func($count) {
  for ($i = 0; $i < $count; $i++) {
    yield $i * 2;      
  }
}

foreach (func(100) as $value) {
  echo $value . "\n";
}