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Comments (4)

superdaigo avatar superdaigo commented on July 3, 2024

The next template's syntax was wrong.

{{ b.{{ a.x }} }}

You can use nested "for" tag instead of nested "{{ }}" tag like below or prepare ordered $b array in php code.

<ul>
{% for a in arr %}
    {% for i, b_val in b %}
        {% if i == a.x %}
            <li>{{ b_val }}</li>
        {% endif %}
    {% endfor %}
{% endfor %}
</ul>

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clphillips avatar clphillips commented on July 3, 2024

Thanks superdaigo. The example you provided works, however it is extremely inefficient (O(n^2): nested loop, can't break after item found).

Here's what I'm looking for in PHP for comparison:

foreach ($arr as $a) {
    echo $b[$a['x']];
}

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superdaigo avatar superdaigo commented on July 3, 2024

Hi, clphillips.
It's true that the nested "for loop" is inefficient and deep nest was evil.
If you worry about the efficiency, here is two solutions.

  1. Create ordered variables before render to template.

    $arr = array(
        array('x' => 0),
        array('x' => 1),
        array('x' => 2),
        array('x' => 3),
    );
    
    $b = array(1, 2, 3, 4);
    // prepare
    $b_ordered = array();
    foreach ($arr as $a) {
        $b_ordered[] = $b[$a['x']];
    }
    // render
    h2o->render(array( 'b_new' => $b_ordered ));
    {% for b_val in b_new %}
      {{ b_val }}
    {% endfor %}
  2. Create custom tags or extensions.
    ... It's not easier than above and probably too much ...

The "h2o" is fast and simple template engine. I think something complex should be done in PHP code.

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clphillips avatar clphillips commented on July 3, 2024

Thanks again superdaigo.

You solution in #1 is exactly what I did as a work around. I'm still concerned with it, because if you analyze the run time (PHP + h2o) it's still a nested loop (O(n^2)). However, it gets the job done and keeps the template simple and easy to understand (which is why we chose h2o to begin with). :)

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