replace string with PHP code - php

Question

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.

Answer 1

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";
?>

Answer 2

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);
}
}
}
?>

Answer 3

I think you just want this, don't you?
<?php
$replacement = file_get_contents('myfile.php');
$content = str_replace('{foo}', eval($replacement), $content);
?>

Answer 4

If you need to replace any string on series of files on your remote server and well you don't have time for it! , here is your solution , I hope it can help someone.
////
//PHP 5.3 + Class find and replace string in files
//
//by Bruce Afruz
//
//2013
//
//example usage for single file:
//
//$new = new fileReplacement('./');
//$new->setExt("check.php");
//$new->changeContents("hello", "goodbye");
//
//example usage for multiple files:
//
//$new = new fileReplacement('./test');
//$new->setExt("*.html");
//$new->changeContents("hello", "goodbye");
//
//to change directory:
//
//$new = new fileReplacement('./test');
//$new->setDir("./test2");
//$new->setExt("*.html");
//$new->changeContents("hello", "goodbye");
////
class fileReplacement
{
private $ext , $dir ;
public function getDir() {
return $this->dir;
}
public function setDir($dir) {
$this->dir = $dir;
}
public function getExt() {
return $this->ext;
}
public function setExt($ext) {
$this->ext = $ext;
}
function __construct($dir) {
$this->dir = $dir;
}
public function rglob($pattern = '*', $flags = 0, $path = '') {
chdir($this->getDir());
$paths = glob($path . '*', GLOB_MARK | GLOB_ONLYDIR | GLOB_NOSORT);
$files = glob($path . $pattern, $flags);
foreach ($paths as $path) {
$files = array_merge($files, $this->rglob($pattern, $flags, $path));
}
return $files;
}
public function changeContents($replace , $sentence , $flags = 0, $path = '') {
$all = $this->rglob($this->getExt() , $flags, $path);
foreach ($all as $file) {
$filename = $file;
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));
fclose($handle);
$contents = str_replace($replace , $sentence, $contents);
if (is_writable($filename)) {
if (!$handle = fopen($filename, 'w+')) {
echo "Cannot open file ($filename)
";
exit;
}
// Write $contents to our opened file.
if (fwrite($handle, $contents) === FALSE) {
echo "Cannot write to file ($filename)
";
exit;
}
echo "Success, wrote content to file ($filename)
";
fclose($handle);
} else {
echo "The file $filename is not writable
";
}
}
}}