How to replace variable with values in another file

Question

I am trying to replace values of variable

I have following file

demo.html

<h1>{$heading}</h1>
<p>{$paragraph}</p>

demo.php

    $html = file_get_contents('email.html', true);
    eval($html);

here I am trying to include that file and replace values of $heading and $paragraph and than echo.

my question is how to do that?

Sean · Accepted Answer · 2015-10-09 11:22:26Z

1

First off, eval() is not needed for this code, as it contains no PHP which needs to be executed. eval() is a very dangerous function. You contents is in $html as a string, therefore, you can now use a significantly safer function called str_replace() to look for, and replace the value placeholders with the correct data.

The function uses the following arguments: str_replace($search, $replace, $subject), accepts arrays as arguments, and returns the full string with replaced values.

Therefore, to answer your question:

// $html = ...

$search = array(
    '{$heading}',
    '{$paragraph}'
);
$replace = array(
    'My Heading',
    'My Paragraph',
);

$replaced_string = str_replace($search, $replace, $html)

answered Oct 9, 2015 at 11:22

Sean

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2 Comments

statelessMind Over a year ago

very dangerous because it sounds like evil ? And the variables in the code can be evaluated if its done right ;) But like goto everybody avoid to use it. PHP is dangerous at all if you are not using it with save coded conditions.

Sean Over a year ago

Absolutely. For a trivial task however, using eval is dangerous because it opens up exploits that an inexperienced developer might not know about. While it could be eval()'d, there is an alternative option which does the same thing, and is a lot safer :)

Rene Korss · Accepted Answer · 2015-10-09 11:20:47Z

0

Use str_replace.

$replace = array(
  '{$heading}'   => 'Replaced heading',
  '{$paragraph}' => 'Replaced paragraph'
);

$html = file_get_contents('email.html', true);
$html = str_reaplce(array_keys($replace), array_values($replace), $html);
echo $html;

answered Oct 9, 2015 at 11:20

Rene Korss

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Comments

statelessMind · Accepted Answer · 2015-10-09 11:20:50Z

0

Change demo.html to demo.tpl.php

In demo.php just do:

 $heading = 'Heading';
 $paragraph = 'Para';
 include 'demo.tpl.php';

That should work.

OR if no name change is possible, in demo.php do:

$heading = 'Heading';
$paragraph = 'Para';
print str_replace(
          array('{$heading}','{$paragraph}'), # use '  not " here!!!
          array($heading,$paragraph),
          file_get_contents('demo.html'));

Should work too.

answered Oct 9, 2015 at 11:20

statelessMind

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