Using PHP with Mustache: Practical Examples and Gotchas

If you want clean templates in PHP without pulling in a full framework, Mustache is a great fit. It keeps logic out of views, which forces you to prepare data in PHP first and makes templates easier to scan later. Think of it as a small habit that prevents messy presentation code from creeping in. 💡

A minimal setup is straightforward: install a Mustache implementation, create a renderer, and pass a plain array as context. Keep your template focused on placeholders and sections, then shape everything in your controller/service layer. In Mustache, {{#items}} starts a section that automatically iterates each element in items, so the inner markup behaves like a loop body per row.

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<?php
require ‘vendor/autoload.php’;

$mustache = new Mustache_Engine([
    ‘loader’ => new Mustache_Loader_FilesystemLoader(__DIR__ . ‘/templates’),
]);

$context = [
    ‘title’ => ‘Weekly report’,
    ‘items’ => [
        [‘name’ => ‘API latency’, ‘value’ => ‘120ms’],
        [‘name’ => ‘Error rate’, ‘value’ => ‘0.4%’],
    ],
    ‘hasWarnings’ => true,
];

echo $mustache->render(‘report’, $context);

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<h2>{{title}}</h2>
<ul>
  {{#items}}
    <li>{{name}}: {{value}}</li>
  {{/items}}
</ul>
{{#hasWarnings}}
  <p>Please review warning metrics.</p>
{{/hasWarnings}}

Gotcha #1: Mustache is logic-less on purpose. No complex conditionals, no inline calculations, and no arbitrary PHP in templates. If you feel stuck, that is usually a signal to move transformation logic into PHP before render. Gotcha #2: escaping behavior matters — {{value}} is escaped by default, while triple braces are unescaped. Only use unescaped output for trusted HTML; otherwise you can introduce XSS risk quickly. 🔐

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<?php
$context = [
    ‘safe’ => ‘<strong>Hello</strong>’,
    ‘unsafe’ => ‘<script>alert(1)</script>’,
];

$template = ‘{{safe}} | {{{safe}}} | {{{unsafe}}}’;
echo $mustache->render($template, $context);

Gotcha #3: naming drift between context keys and template variables can silently render blanks. I usually keep small view-model builders (or DTOs) so key names are consistent across pages. If you keep templates dumb, context explicit, and escaping intentional, PHP + Mustache stays simple and maintainable for a long time. 🎉

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