Pipe operator в PHP 8.5: реальные примеры использования

maxboychuk16 May 2026 06:04

PHP 8.5 added the pipe operator |>. Arrow functions on the right side must be wrapped in parentheses.

Basic syntax: $value |> (fn($x) => someFunction($x)). The value on the left is passed as the argument to the callable on the right.

PHP
<?php
// Old way: nested calls read right to left
$result = array_sum(array_map(fn($x) => $x * 2, array_filter([1, 2, 3, 4, 5], fn($x) => $x % 2 === 0)));
echo $result . "\n"; // 12
// With pipe operator: reads left to right
// Note: arrow functions must be parenthesized on the right side of |>
$result = [1, 2, 3, 4, 5]
|> (fn($a) => array_filter($a, fn($x) => $x % 2 === 0))
|> (fn($a) => array_map(fn($x) => $x * 2, $a))
|> (fn($a) => array_sum($a));
echo $result . "\n"; // 12
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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String transformation example:

PHP
<?php
$process = " Hello, World! "
|> (fn($s) => trim($s))
|> (fn($s) => strtolower($s))
|> (fn($s) => str_replace(', ', '-', $s))
|> (fn($s) => rtrim($s, '!'));
echo $process . "\n"; // hello-world
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Named functions do not need parentheses since they are not arrow functions:

PHP
<?php
function double(int $n): int { return $n * 2; }
function square(int $n): int { return $n * $n; }
$result = 3 |> double(...) |> square(...);
echo $result . "\n"; // (3*2)^2 = 36
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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The parenthesis requirement applies only to arrow functions and closures, not to first-class callable syntax like trim(...).

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Replies (1)
johnsmith16 May 2026 06:35

Tested in sandbox. The parentheses around arrow functions are required in PHP 8.5, otherwise you get a fatal error. Here is a practical example with input sanitization:

PHP
<?php
function sanitizeInput(string $input): string
{
return $input
|> (fn($s) => strip_tags($s))
|> (fn($s) => trim($s))
|> (fn($s) => preg_replace('/\s+/', ' ', $s))
|> (fn($s) => htmlspecialchars($s, ENT_QUOTES, 'UTF-8'));
}
$dirty = " <script>alert('xss')</script> Hello World ";
echo sanitizeInput($dirty) . "\n";
// Hello World
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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And numeric transformations:

PHP
<?php
$result = "3.14159"
|> (fn($s) => (float) $s)
|> (fn($n) => $n * 2)
|> (fn($n) => round($n, 2))
|> (fn($n) => "Result: $n");
echo $result . "\n";
// Result: 6.28
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Readability improves noticeably when there are more than four steps. The parentheses add some noise but it is still cleaner than deeply nested calls.

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Markdown. ```php blocks are runnable.