Question

I came across this script at http://www.php.net/manual/en/function.str-split.php#78040

   /**
     Returns a formatted string based on camel case.
     e.g. "CamelCase" -> "Camel Case".
    */
    function FormatCamelCase( $string ) {
            $output = "";
            foreach( str_split( $string ) as $char ) {
                    strtoupper( $char ) == $char and $output and $output .= " ";
                    $output .= $char;
            }
            return $output;
    }

The curios Part Is :

strtoupper( $char ) == $char and $output and $output .= " ";

My Question

• A detailed break down of strtoupper( $char ) == $char and $output and $output .= " "; and why its valid
• This would not work for break , return , echo but it works for any function including print
• Is this Best Practice
• Do such code have any advantages or disadvantages

Answer 1

It is same as

if (strtoupper( $char ) == $char) {
    if ($output) {
         $output .= " ";
    }  
}

For the code A and B, B will be executed if A is evaluated to true.

The difference between && and and is && has higher precedence than and, .= is between them.