How can multiple {eval:}-placeholders in a template be handled effectively in PHP?

When dealing with multiple {eval:}-placeholders in a template in PHP, one effective way to handle them is by using the preg_replace_callback() function along with a custom callback function. This allows you to dynamically evaluate the placeholders and replace them with the desired output. 

<?php
// Sample template with multiple {eval:} placeholders
$template = "Hello {eval: strtoupper('world')}! Welcome to {eval: date('Y')}.";

// Custom callback function to evaluate the placeholders
function evalCallback($matches) {
    return eval('return '.$matches[1].';');
}

// Replace {eval:} placeholders with evaluated values
$output = preg_replace_callback('/{eval:\s*(.*?)}/', 'evalCallback', $template);

echo $output;
?>

Keywords

eval placeholders template handling PHP

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