preg_replace() help to convert {$variable} to php echo variable statement

Question

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.

You can read how here:php.net/manual/en/function.preg-replace.php — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Jun 14, 2013 at 12:52
Why don't you try simple: $html_template = str_replace('{$username}', $username, $html_template); — Stanislav Terletskyi
– Stanislav Terletskyi, Commented Jun 14, 2013 at 12:56
Why preg_replace() and not str_replace()? Why replace it with PHP code instead of the real value? — str
– str, Commented Jun 14, 2013 at 12:57

Dale · Accepted Answer · 2013-06-14 13:00:40Z

1

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.

answered Jun 14, 2013 at 13:00

Dale

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2 Comments

Poush Over a year ago

Will you tell me any tutorial for regular expression

Dale Over a year ago

@Poush One good resource that springs to mind is regular-expressions

luk2302 · Accepted Answer · 2013-06-14 12:59:22Z

0

preg_replace('/\{\$username\}/', '<?php echo $username; ?>', $text);

or in general:

preg_replace('/\{\$([^\}]+)\}/', '<?php echo $$1; ?>', $text);

answered Jun 14, 2013 at 12:59

luk2302

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1 Comment

Poush Over a year ago

Thank you! Will you tell me any tutorial for regular expression ?

Stanislav Terletskyi · Accepted Answer · 2013-06-14 13:12:00Z

0

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...

answered Jun 14, 2013 at 13:12

Stanislav Terletskyi

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4 Comments

Poush Over a year ago

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.

Stanislav Terletskyi Over a year ago

It is possible to use it in that way: str_replace(array('tmp1', 'tmp2', ... 'tmp_n'), array($var1, $var2, ... $var_n), $content);

Stanislav Terletskyi Over a year ago

Note, preg functions eats huge count resources, where it possible we aren't need use them.

Stanislav Terletskyi Over a year ago

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; }

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