Databases
StackOverflow2013
Postsdbo
POHow to expand variables in a string
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to expand variables in a string
    primarykey
    data
    text
    <h3>Problem</h3> <p>I'd like to expand variables in a string in the same manner that variable in a double quoted string get expanded.</p> <pre><code>$string = '&lt;p&gt;It took $replace s&lt;/&gt;'; $replace = 40; expression_i_look_for; </code></pre> <p><code>$string</code> should become <code>'&lt;p&gt;It took 40 s&lt;/&gt;';</code></p> <p>I see a obvious solution like this:</p> <pre><code>$string = str_replace('"', '\"', $string); eval('$string = "$string";'); </code></pre> <p>But I really don't like it, because eval() is insecure. Is there any other way to do this ?</p> <h3>Context</h3> <p>I'm building a simple templateing engine, that's where I need this.</p> <p>Example Template (view_file.php)</p> <pre><code>&lt;h1&gt;$title&lt;/h1&gt; &lt;p&gt;$content&lt;/p&gt; </code></pre> <p>Template rendering (simplified code):</p> <pre><code>$params = array('title' =&gt; ...); function render($view_file, $params) extract($params) ob_start(); include($view_file); $text = ob_get_contents(); ob_end_clean(); expression_i_look_for; // this will expand the variables in the template return $text; } </code></pre> <p>The expansion of the variables in the template simplifies it's syntax. Without it, the above example template would be:</p> <pre><code>&lt;h1&gt;&lt;?php echo $title;?&gt;&lt;/h1&gt; &lt;p&gt;&lt;?php echo $content;?&gt;&lt;/p&gt; </code></pre> <p>Do you think this approach is good ? Or should I look in another direction ?</p> <h3>Edit</h3> <p>Finally I understand that there is no simple solution due to flexible way PHP expands variables (even <code>${$var}-&gt;member[0]</code> would be valid.</p> <p>So there are only two options:</p> <ol> <li>Adopt an existing full fledged templating system</li> <li>Stick with something very basic that essentially is limited to including the view files via <code>include</code>.</li> </ol>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USLorenz Meyer
    1. USLorenz Meyer
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhy not take a look at some of the big ( or small ) PHP templating engines that exist and see how they do it. This wheel has been invented so often that I would expect to see some fairly standard solutions around by now. There may even be an extension or library that will do 90% of the work for you. Of course, the wise man now is likely to be looking at using the server just for data and doing most of the display logic on the client with JavaScript.
      singulars
      1. POHow to expand variables in a string
      1. USglenatron
    2. COYou're trying to build a templating system, which is what PHP already is.
      singulars
      1. POHow to expand variables in a string
      1. USMarc B
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload