What does php twig mean?

php twig is a flexible, fast and secure PHP template engine. Twig compiles templates into pure, optimized PHP code; Twig has a sandbox mode for evaluating untrusted template code ;Twig is driven by a flexible lexer and parser.

php twig

Twig is a flexible, fast and safe PHP template engine.

Fast: Twig compiles templates into pure, optimized PHP code. Its overhead has been reduced to extremely low compared with conventional PHP code.

Security: Twig has a sandbox mode for evaluating untrusted template code. This allows Twig to be used in applications that allow users to modify the template design themselves.

Flexible: Twig is powered by a flexible lexer and parser. This allows developers to customize tags and filters and create their own DSL.

Why is there this template engine?

When bringing a template engine to PHP, many people will tell you that PHP itself is a template engine. Although PHP was originally used as a template language, it has not evolved like any template engine in recent years. In fact, it does not support many features of modern template engines:

Conciseness: The PHP language is ridiculously verbose when it comes to output escaping.

<?php echo $var ?>
<?php echo htmlspecialchars($var, ENT_QUOTES, &#39;UTF-8&#39;) ?>

In contrast, Twig has a very concise syntax, which makes templates more readable:

{{ var }}
{{ var|escape }}
{{ var|e }}         {# shortcut to escape a variable #}

Template-oriented syntax: Twig provides shortcuts for common patterns, such as When iterating over an empty array, a default text is displayed:

{% for user in users %}
    * {{ user.name }}
{% else %}
    No users have been found.
{% endfor %}

Fully featured: Twig gives you everything you need to easily build powerful templates: multiple inheritance, blocks, automated output escaping, and many other features:

{% extends "layout.html" %}
{% block content %}
    页面内容...
{% endblock %}

Easy to learn: Twig's syntax is very easy to learn, and even web designers can complete their work quickly without any hindrance:

Of course, PHP is also the language used in many template engine projects. But most of them are still developed using PHP 4 and do not support best web development practices:

Scalability: Twig is flexible enough to meet your needs even in the most complex cases need. Thanks to the open architecture, you can implement your own language constructs (tags, filters, functions, even operators, etc.) to create your own DSL.

Has been unit tested: Twig has undergone complete unit testing. It is stable and can be used in large projects.

Documentation: Twig has complete documentation, as well as dedicated online manuals, and of course complete API documentation.

Security: Speaking of security, Twig has some unique features:

Automatic output escaping: For security reasons, you can enable automatic output escaping globally, or only for a certain block :

{% autoescape true %}
    {{ var }}
    {{ var|raw }}     {# var won't be escaped #}
    {{ var|escape }}  {# var won't be doubled-escaped #}
{% endautoescape %}

Sandbox: Twig can evaluate any template in a sandbox environment, and users can only access a limited set of tags, filters, and object methods defined by the developer. Sandboxing can be enabled globally or individually for certain templates:

{{ include('page.html', sandboxed = true) }}

Clear error messages: Whenever you encounter a syntax error in a template, Twig will output help with the file name and line number of the error information. It's very helpful for debugging.

Fast: One of Twig's goals is to be as fast as possible. To achieve the best speed possible, Twig compiles templates into extremely optimized PHP code. Its overhead has been reduced to extremely low compared with conventional PHP code.

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