PHP Generator::next() Method: Usage and Examples

The PHP Generator::next API performs a focused operation on an object or value. The examples below show its effect on actual data.

Advances to the next iteration position; an exhausted iterator has no current entry.

What Is Generator::next in PHP?

Advances to the next iteration position; an exhausted iterator has no current entry.

Syntax:

Generator::next(): void

This operation has no parameters.

Return type declared by PHP: void. The value or side effect is demonstrated in the examples below.

Example 1: Basic Usage

This example uses a small input to make the main behavior visible.

<?php

$generator = (function (): Generator {
    yield "alpha" => 10;
    $response = yield "beta" => 20;
    return $response ?? "complete";
})();
$generator->next();
var_dump($generator->current());

Output:

int(20)

Advances to the next iteration position; an exhausted iterator has no current entry.

Example 2: A Different Input

A different set of values shows the same operation in another situation.

<?php

$generator = (function (): Generator {
    yield "east" => 15;
    $response = yield "west" => 35;
    return $response ?? "complete";
})();
$generator->next();
var_dump($generator->current());

Output:

int(35)

A generator generally cannot be rewound after progressing beyond its first yield; getReturn() requires completion.

Practical Example: Applying the Feature

This example shows an application-style use of the feature, with its surrounding setup visible.

<?php

$generator = (function (): Generator {
    yield "east" => 25;
    $response = yield "west" => 55;
    return $response ?? "complete";
})();
$generator->next();
var_dump($generator->current());

Output:

int(55)

The code is shown for learning. Adjust the class names, inputs and error handling to suit your application.

Important Behavior and Edge Cases

• A generator generally cannot be rewound after progressing beyond its first yield; getReturn() requires completion.
• Advances to the next iteration position; an exhausted iterator has no current entry.
• Observe differences in empty inputs, invalid states and optional extension availability where relevant.

Comparison With Related Approaches

Common Beginner Mistakes

Key Takeaways

• Advances to the next iteration position; an exhausted iterator has no current entry.
• A generator generally cannot be rewound after progressing beyond its first yield; getReturn() requires completion.
• Use the example that matches the values, runtime version and dependencies in your application.

Generator::next is useful when its behavior matches the data structure and lifecycle of your PHP application. Choose it with a clear understanding of its preconditions and returned values.