PHP preg_replace: use variable

Question

I'm having a problem using a variable from preg_replace. Basically what I want to achieve is to look for some patterns in a text, and replace them by content. The replacement is done in a seperate function (retrieveValue() ). However I'm having difficulties passing the variable ('$1').

$types = array(
        array(
                '/\*#(.*?)#\*/',
                $this->retrieveValue($templateVars,'$1')    
             )
        );

    foreach ($types as $type) {
        $template = preg_replace($type[0], $type[1], $template);
    }

Felix Kling · Accepted Answer · 2011-02-19 12:32:08Z

4

The problem is that $this->retrieveValue($templateVars,'$1') is executed before you call preg_replace.

Solution: Have a look at preg_replace_callback.

I suggest you create a new method in your class:

public function _replace($matches) {
    return $this->retrieveValue($templateVars, $matches[1]);
}

and then can use:

preg_replace_callback('/\*#(.*?)#\*/', array($this, '_replace'), $template);

You can also make use of anonymous functions in PHP 5.3.

edited Feb 19, 2011 at 12:32

answered Feb 19, 2011 at 12:04

Felix Kling

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3 Comments

user485659 Over a year ago

Thanks this seems to be working, however is it possible to pass additional parameters to the _replace function (in addition to the $matches) ?

Felix Kling Over a year ago

@user485659: No. But if you use PHP 5.3 you can use anonymous functions and closures.

Felix Kling Over a year ago

@user485659: If you need to pass further parameters and you don't have PHP 5.3, have a look at create_function. Maybe you can somehow add the parameters differently.

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