private function isValidPlaceholderCharacter($character)
    {
        $asciiCode = ord($character);

        return (($asciiCode >= 48) && ($asciiCode <= 57))
            || (($asciiCode >= 65) && ($asciiCode <= 90))
            || (($asciiCode >= 97) && ($asciiCode <= 122));
    }
private function isValidPlaceholderCharacter($character)
    {
        $asciiCode = ord($character);

        return (($asciiCode >= 48) && ($asciiCode <= 57))
            || (($asciiCode >= 65) && ($asciiCode <= 90))
            || (($asciiCode >= 97) && ($asciiCode <= 122));
    }
private function isValidPlaceholderCharacter ( $ character ) { $ asciiCode = ord ( $ character ) ; return ( ( $ asciiCode >= 48 ) && ( $ asciiCode <= 57 ) ) || ( ( $ asciiCode >= 65 ) && ( $ asciiCode <= 90 ) ) || ( ( $ asciiCode >= 97 ) && ( $ asciiCode <= 122 ) ) ; }
Checks if the character is a valid placeholder character.

@param string $character The character to check.

@return boolean TRUE if the character is a valid placeholder character else FALSE.
Checks if the character is a valid placeholder character .