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I need to find a string within a string ("foo", for example) and then replace it with a PHP code. Is it possible?

I'm creating a Joomla Plugin. When my article has something like "{foo}", i will replace it with an include (require, or whatever).

I've made something like:

public function onContentBeforeDisplay($context, &$row, &$params, $page=0)
    {
        // $row->text has the article text ...
        if (preg_match('/{contact-form}/', $row->text))
        {
            require_once(dirname(__FILE__) . DS . 'tmpl' . DS . 'default.php');
        }
    }

But this code will insert default.php at the beginning. I want to replace it in {contact-form} tag.

Thank you.

share|improve this question
2  
Could you please explain the context of your problem and provide an example? –  Felix Kling Feb 10 '11 at 13:23
 
Have you tried str_replace? –  deceze Feb 10 '11 at 13:24
 
@deceze the question was tagged with str-replace, you'd almost assume the OP checked the docs first... wouldn't you? ;-) –  richsage Feb 10 '11 at 13:26
 
str_replace adds the code without evalute it. –  thom Feb 10 '11 at 13:28
 
@rich Good point. :o) @thom Why don't you run the code first and replace {foo} with the result of the run code? –  deceze Feb 10 '11 at 13:30
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3 Answers

up vote 0 down vote

You can use the PHP function "substr_replace()", whose details are given here. \n";

/* These two examples replace all of $var with 'bob'. */
echo substr_replace($var, 'bob', 0) . "<br />\n";
echo substr_replace($var, 'bob', 0, strlen($var)) . "<br />\n";

/* Insert 'bob' right at the beginning of $var. */
echo substr_replace($var, 'bob', 0, 0) . "<br />\n";

/**
 * Your food & search is here
 */
/* These next two replace 'MNRPQR' in $var with 'bob'. */
echo substr_replace($var, 'bob', 10, -1) . "<br />\n";
echo substr_replace($var, 'bob', -7, -1) . "<br />\n";

/* Delete 'MNRPQR' from $var. */
echo substr_replace($var, '', 10, -1) . "<br />\n";
?>
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up vote 0 down vote

You can create a PHP file that matches the keyword (like: foo.php) and simply extract the keyword from the text and use it to include that file.

For example:

<?php
$str = "This is {foo} text";
$includePath = "/path/to/my/files/";

// Careful with the Regular Expression. If you allow chars like . in the
// keyword this could create a security problem. (Dots allow you to go backwards
// which would allow people to execute files outside your path.)
if (preg_match_all('/\{([\w]+)\}/', $str, $matches))
{
    foreach ($matches[1] as $_match)
    {
        $filePath = $includePath . $_match . ".php";
        if (file_exists($filePath))
        {
            include $filePath;
        }
        else
        {
            trigger_error("File does not exist '$filePath'.", E_USER_WARNING);
        }
    }
}
?>
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up vote 0 down vote

I think you just want this, don't you?

<?php

$replacement = file_get_contents('myfile.php');

$content = str_replace('{foo}', eval($replacement), $content);

?>
share|improve this answer
 
No, I don't want it. –  thom Feb 10 '11 at 14:19
1  
er... okay, fair enough.... :S –  simon Feb 10 '11 at 14:30

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