<?php

function testIt($func) {
    $hex = '';
    $chars = preg_split('//', $func, -1, PREG_SPLIT_NO_EMPTY);
    foreach ($chars as $c) {
        $hex .= sprintf("\x%02X", ord($c));
    }
    echo "------------------------------------\n";
    echo "Function:        $func\n";
    echo "Hex:             $hex\n";
    echo "Length:          " . strlen($func) . "\n";
    echo "Trimemed length: " . strlen(trim($func)) . "\n";
    echo "------------------------------------\n";
    echo "\n";
}

echo "\n";
testIt(create_function('$somevar', 'return true;'));
testIt('testIt');
echo "\n";