Introducing updates on how to use generators in php7

Return value of generator

The concept of generator was introduced in PHP5.5. GeneratorFunctiongets a value identified by yield every time it is executed. In PHP7, when the generator iteration is completed, the return value of the generator function can be obtained. Obtained through Generator::getReturn().

<?php
function generator() {
yield 1;
yield 2;
yield 3;
return "a";
}
$generatorClass = ("generator")();
foreach ($generatorClass as $val) {
echo $val.” “;
}
echo $generatorClass->getReturn();

The output is: 1 2 3 a

Introducing other generators into the generator

You can introduce another or several generators into the generator, just write yield from functionName1

<?php
function generator1(){
yield 1;
yield 2;
yield from generator2();
yield from generator3();
}
function generator2(){
yield 3;
yield 4;
}
function generator3(){
yield 5;
yield 6;
}
foreach (generator1() as $val){
echo $val, " ";
}

Output: 1 2 3 4 5 6

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