[PHP8] Install and use PECL YAML function (YAML parser) with Docker

PHP's YAML functions (https://www.php.net/manual/ja/ref.yaml.php) are not bundled with PHP by default.

To parse YAML data into a PHP array (syntax parse and transform), or from a PHP array to YAML data with a YAML function, you need to install the PECL extension Jules (https://www.php) .net / manual / ja / yaml.installation.php).

However, PECL is not installed on the latest (as of 08/28/2020) php: 8.0.0beta2 and php: 8.0.0beta2-alpine images. It seems that PEAR / PECL installer has been eliminated since PHP 7.4.


I need to build PECL from source, which is also a hassle, so I created an image with the pecl command. It works not only with Intel / AMD but also with ARMv5, v7, ARM64 such as Raspberry Pi.

docker pull keinos/php8-jit:latest

--Image: keinos / php8-jit @ DockerHub

$ docker run --rm keinos/php8-jit pecl version
PEAR Version: 1.10.12
PHP Version: 8.0.0-dev
Zend Engine Version: 4.0.0-dev
Running on: Linux 3fc54c34122a 4.19.76-linuxkit #1 SMP Tue May 26 11:42:35 UTC 2020 x86_64

Also, since many pre-built packages in the PECL repository do not work, we also make it possible to install PECL packages from source.

Need yaml-dev

docker-php-ext-pecl install yaml



FROM keinos/php8-jit:latest

USER root

COPY sample.php /app/sample.php

    apk --no-cache add yaml-dev && \
    docker-php-ext-pecl install yaml

ENTRYPOINT [ "php", "/app/sample.php" ]



//YAML sample string
$yaml = <<<EOD
invoice: 34843
date: "2001-01-23"
bill-to: &id001
  given: Chris
  family: Dumars
    lines: |-
      458 Walkman Dr.
              Suite #292
    city: Royal Oak
    state: MI
    postal: 48046
ship-to: *id001
- sku: BL394D
  quantity: 4
  description: Basketball
  price: 450
- sku: BL4438H
  quantity: 1
  description: Super Hoop
  price: 2392
tax: 251.420000
total: 4443.520000
comments: Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338.

//Parse a YAML string into a PHP array
$parsed = yaml_parse($yaml);

//Comparison test
$actual = json_encode($parsed);
$expect = '{"invoice":34843,"date":"2001-01-23","bill-to":{"given":"Chris","family":"Dumars","address":{"lines":"458 Walkman Dr.\n        Suite #292","city":"Royal Oak","state":"MI","postal":48046}},"ship-to":{"given":"Chris","family":"Dumars","address":{"lines":"458 Walkman Dr.\n        Suite #292","city":"Royal Oak","state":"MI","postal":48046}},"product":[{"sku":"BL394D","quantity":4,"description":"Basketball","price":450},{"sku":"BL4438H","quantity":1,"description":"Super Hoop","price":2392}],"tax":251.42,"total":4443.52,"comments":"Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338."}';

echo '- Function test ... ', ($expect === $actual) ? 'OK' : 'NG', PHP_EOL;


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