How to Set and Enforce the Desired Font in Dompdf PDF Generation?

Overcoming Font-Family Discrepancies in Dompdf PDF Generation

Dompdf offers a convenient way to create PDFs, but users often encounter discrepancies where the specified font-family in CSS is overlooked, resulting in the default Times New Roman font in the PDF output. This commonly occurs when a custom font is employed, leading to the question: how can you set and enforce the desired font?

The solution lies in understanding how Dompdf manages fonts. PDF documents inherently support a limited set of fonts. To incorporate other fonts, Dompdf requires them to be pre-loaded or referenced in CSS using the @font-face rule. This pre-loading is essential for generating accurate font metrics during typesetting.

Dompdf supports Type 1 and TrueType fonts, provided their font metrics are available. The PHP-based php-font-lib library assists in loading and sub-setting these fonts.

Methods for Font Loading

There are several approaches to load fonts:

• CSS @font-face Rules: Load a font dynamically via CSS if it's accessible online.
• Command Line: Use dompdf/load_font.php to load a font from the command line. The required parameters are the font name and the path to the font files.
• Dompdf Admin Site: Access dompdf/www/fonts.php to load fonts through the admin site. Remember to configure the admin credentials before use.

Example: CSS @font-face Rule

To load a font using a CSS @font-face rule, incorporate the following code:

@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: normal;
  src: url(http://themes.googleusercontent.com/static/fonts/opensans/v8/cJZKeOuBrn4kERxqtaUH3aCWcynf_cDxXwCLxiixG1c.ttf) format('truetype');
}

Note: The load_font.php and admin site methods will be deprecated in dompdf 0.7.0 and later.

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