Funzione sbagliata

[P4n1c]

function block_char ($name)
{
    
    $block_char  = strstr($name, '<') ? FALSE : '';
    $block_char .= strstr($name, '>') ? FALSE : '';
    $block_char .= strstr($name, '"') ? FALSE : '';
    $block_char .= strstr($name, "'") ? FALSE : '';
    $block_char .= strstr($name, '$') ? FALSE : '';
    $block_char .= strstr($name, '(') ? FALSE : '';
    $block_char .= strstr($name, ')') ? FALSE : '';
    $block_char .= strstr($name, ';') ? FALSE : '';
    
        if ( $block_char == '' )
    {
    
        return TRUE;
    
    } else {
    
        return FALSE;
    
    }

$a = '>';
if ( block_char($a) )
{
print 1;
} else {
print 2;
} 

Per quale motivo stampa 1 ?
Grazie in anticipo