Runtime evaluation: Difference between revisions

=={{header|PHP}}==

The [http://www.php.net/eval eval construct] allow string evaluation as PHP code. Opening and closing tags are not required. Return statements immediatly terminates evaluation . Eval returns NULL, unless return is called in evalued code.

<lang php>

<?php

$code = 'echo "hello world"';

eval($code);

$code = 'return "hello world"';

print eval($code);

</lang>