[PHP] Syntax Highlighting variables not appearing

[Tom Whitbread]

Can anyone explain why this is happening.
I am using the following code For giving code examples on my website 
with syntax highlighting

$text = '<?php \$my_code = "echo 'text text text text'; \$foo = 'bar';"; example_function(\$my_code); ?&gt';
$body = preg_replace('/&lt;(.*?)&gt;/es', 'highlight_string("<\\1>", true)', $text);
echo $body; //Returns: <?php = 'echo \'text text text text\'\';  = \'bar\'; highlight_string(, true); ?> 
		//I want:  <?php $my_code = "echo 'text text text text'; $foo = 'bar';"; example_function($my_code); ?> 

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