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<?php $args = '$user, $number'; $body = 'echo "#$number: Hello $user.\n";'; function _create_function_without_eval($args, $body) { $func_name = sprintf('temp_func_%s', md5($body)); $code = sprintf("<?php if (!function_exists('%s')) {function %s(%s){%s}}", $func_name, $func_name, $args, $body); $func_file = tempnam('/tmp', $func_name); $handle = fopen($func_file, "w+"); fwrite($handle, $code); fclose($handle); include $func_file; unlink($func_file); return function(...$user_args) use ($func_name) { return call_user_func_array($func_name, $user_args); }; } function _create_function_with_eval($args, $body) { $func_name = sprintf('temp_func_%s', md5($body)); $code = sprintf("if (!function_exists('%s')) {function %s(%s){%s}}", $func_name, $func_name, $args, $body); eval($code); return function(...$user_args) use ($func_name) { return call_user_func_array($func_name, $user_args); }; } $fn_deprecated = create_function($args, $body); $fn_with_eval = _create_function_with_eval($args, $body); $fn_without_eval = _create_function_without_eval($args, $body); echo $fn_deprecated('Old Bob', '1'); echo $fn_without_eval('Bob without eval', 2); echo $fn_with_eval('Bob with eval', 3);