ob_get_clean returns empty in php

Question

I have large amount of data as string which includes text and lots of images.

The string includes specials tags like the following as well as normal text + images.

{{ title }}

I have a function which check if that string contains any php tags ?> or <?php

The function is

    protected function parseTxt($text){
        echo $text; //Gives me correct string
        ob_start();
        $result = eval('?>'.$text.'<?php ');                        
        if ($result === false){
          echo '<br />You have a syntax error.The snippet of text that contains 
the error has been output below:<br />';
          exit(str_replace(array('?>', '<?php '), '', $text));
        }
        return ob_get_clean();
      }

I get the str as null.

I have php 5.5 and I have increased memory limit to 512

Please suggest as I am not having any alternative clue.Any help is highly appreciated.

Answer 1

Your code must be exiting before reaching ob_get_clean() . Also, dont use eval. Just dont. Why dont you just echo $text ?

PS

eval is evil