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PreMailer

Introduction

Crossjoin\PreMailer converts CSS in a given HTML source to inline styles and optimizes it for sending it via e-mail. It also creates a text version of the HTML source.

Installation

This is a composer package. See the composer website for basic installation information.

Add the following line to your composer.json file:

{
    "require": {
        "crossjoin/pre-mailer": "1.0.*"
    }
}

Features

  • Extracts CSS from HTML sources
  • Can move CSS to the body of the HTML document (so it won't be removed by some e-mail clients)
  • Can remove comments from the HTML document
  • Can remove all class attributes from the HTML document
  • Compresses the CSS
  • Creates a text version of the HTML document (for the alternative part of the e-mail)
  • ...

Usage

Reading HTML

You can read different HTML sources.

// Read HTML file
$htmlFileName = "path/to/file.html";
$preMailer = new \Crossjoin\PreMailer\HtmlFile($htmlFileName);

// Read HTML string
$htmlString = "<html>...</html>";
$preMailer = new \Crossjoin\PreMailer\HtmlString($htmlString);

Set charset

The default charset is "UTF-8". You can change it to the preferred charset.

// Sets the charset of the HTML file.
$preMailer->setCharset("ISO-8859-1");

Set options

You can set different options to influence the PreMailer behavior.

// Remove HTML comments (default)
$preMailer->setOption($preMailer::OPTION_HTML_COMMENTS, $preMailer::OPTION_HTML_COMMENTS_REMOVE);

// Keep HTML comments
$preMailer->setOption($preMailer::OPTION_HTML_COMMENTS, $preMailer::OPTION_HTML_COMMENTS_KEEP);

// Move the style tag to the body of the HTML document (default)
$preMailer->setOption($preMailer::OPTION_STYLE_TAG, $preMailer::OPTION_STYLE_TAG_BODY);

// Move the style tag to the head of the HTML document
$preMailer->setOption($preMailer::OPTION_STYLE_TAG, $preMailer::OPTION_STYLE_TAG_HEAD);

// Remove the style tag from the HTML document
// (to use, if ALL of your styles can be written inline)
$preMailer->setOption($preMailer::OPTION_STYLE_TAG, $preMailer::OPTION_STYLE_TAG_REMOVE);

// Keep HTML class attributes (default)
$preMailer->setOption($preMailer::OPTION_HTML_CLASSES, $preMailer::OPTION_HTML_CLASSES_KEEP);

// Remove HTML class attributes
$preMailer->setOption($preMailer::OPTION_HTML_CLASSES, $preMailer::OPTION_HTML_CLASSES_REMOVE);

// Set line-width of the text version (defaults to 75)
$preMailer->setOption($preMailer::OPTION_TEXT_LINE_WIDTH, 60);

// Set CSS writer class (class that extends \Crossjoin\Css\Writer\WriterAbstract).
// By default the Compact writer (\Crossjoin\Css\Writer\Compact) is used, but for
// some purposes another writer (like \Crossjoin\Css\Writer\Pretty) can be useful.
$preMailer->setOption($preMailer::OPTION_CSS_WRITER_CLASS, $preMailer::OPTION_CSS_WRITER_CLASS_PRETTY);
// Instead of the constant also the full class name can be used:
$preMailer->setOption($preMailer::OPTION_CSS_WRITER_CLASS, '\Crossjoin\Css\Writer\Pretty');
// So you can use your own writer if required:
$preMailer->setOption($preMailer::OPTION_CSS_WRITER_CLASS, '\MyNameSpace\Css\Writer\MyWriter');

Generate the content

The PreMailer generated an optimized HTML and text version for the e-mail.

// Get the HTML version
$html = $preMailer->getHtml();

// Get the text version
$text = $preMailer->getText();

To Do

  • Add charset auto-detection (extracted from the HTML document)
  • Ability to influence the text version format
  • Optimize inline styles (remove declarations that are overwritten within the same inline style)