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up vote 0 down vote favorite

I am working on small template class. I need help in converting {$variable} written in template file to be converted to

Like : 

<html>
   <body>
      <p> Hey Welcome {$username} </p> 
   </body>
</html>

to be converted to 

    <html>
   <body>
      <p> Hey Welcome <?php echo $username ?> </p> 
   </body>
</html>

Just like variable username. there can be any variable with any length. I just want to convert it to php echo statment.

I think it is possible with preg_replace() but don't know how.

share|improve this question
1  
You can read how here:php.net/manual/en/function.preg-replace.php –  Casimir et Hippolyte Jun 14 '13 at 12:52
    
Why don't you try simple: $html_template = str_replace('{$username}', $username, $html_template); –  Stanislav Terleckiy Jun 14 '13 at 12:56
    
Why preg_replace() and not str_replace()? Why replace it with PHP code instead of the real value? –  str Jun 14 '13 at 12:57
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3 Answers

up vote 0 down vote accepted

How's this?

$string = 'Hello {$username}, how are you?';
$new_string = preg_replace('/\{(\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\}/', '<?php echo \\1; ?>', $string);
echo $new_string;

Which gives this:

Hello <?php echo $username; ?>, how are you?

I borrowed that expression from the php manual..

Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'

So in theory it should match any valid variable.

share|improve this answer
    
Thank you ! This is exactly same what i need. –  Poush Jun 14 '13 at 15:10
    
Will you tell me any tutorial for regular expression –  Poush Jun 14 '13 at 15:15
    
@Poush One good resource that springs to mind is regular-expressions –  Dale Jun 14 '13 at 18:42
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up vote 0 down vote 
preg_replace('/\{\$username\}/', '<?php echo $username; ?>', $text);

or in general:

preg_replace('/\{\$([^\}]+)\}/', '<?php echo $$1; ?>', $text);
share|improve this answer
    
Thank you! Will you tell me any tutorial for regular expression ? –  Poush Jun 14 '13 at 15:14
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up vote 0 down vote

For example: you have app folder structure:

  • app/view/index.template
  • app/controller/index.php
  • app/index.php

Where "app" folder is webroot

So, file "app/view/index.template" contains:

<html>
   <body>
      <p> Hey Welcome {$username} </p> 
   </body>
</html>

And "app/controller/index.php" contains next:

<?php
    $username = 'My Hero';
    $content = file_get_contents(__DIR__ . '../view/index.template');
    if ($content) {
        echo str_replace('{$username}', $username, $content);
    } else { echo 'Sorry, file not found...';}

And "app/index.php" contains next:

<?php
    include __DIR__ . '/controller/index.php';

Something like that...

share|improve this answer
    
Your idea in nice but my script has not limited variable. I have to write str_replace() for each statement which is not even set(known) when making controller. Controller will get list of variables by another script/page during executing. –  Poush Jun 14 '13 at 15:08
    
It is possible to use it in that way: str_replace(array('tmp1', 'tmp2', ... 'tmp_n'), array($var1, $var2, ... $var_n), $content); –  Stanislav Terleckiy Jun 14 '13 at 15:47
    
Note, preg functions eats huge count resources, where it possible we aren't need use them. –  Stanislav Terleckiy Jun 14 '13 at 15:51
    
And you can organize you template handler function with loop like: $vars = array('tmp_1'=>$var1, 'tmp_2'=>$var2, ... 'tmp_n'=>$var_n); echo render($content, $vars); function render($content, $vars) { foreach ($vars as $tmp => $var) { str_replace("{$$tmp}", $var, $content); } return $content; } –  Stanislav Terleckiy Jun 14 '13 at 15:54
    
Wow! Thanks for this great idea. –  Poush Jun 14 '13 at 16:12
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