substring mothod for JAVA、PHP、javascript

以下為PHP、JAVA、javascript的substring語法

PHP 

string substr ( string $string , int $start [, int $length ] )

JAVA

public String substring(int beginIndex)

or

public String substring(int beginIndex, int endIndex)

javascript

string.substring(from, to)

String length method for PHP、JAVA、javascript

PHP:

int strlen ( string $string )

JAVA:(String object)

public int length()

javascript:

string.length