Syntax Comparison of Javascript, Perl, PHP, and VBA
| Javascript | Perl | PHP | VBA | |
|---|---|---|---|---|
| user defined function | function name (arg1, arg2 ...) { | sub name { [no args] | function name ($arg1, $arg2, ..., $argn) { | function funcname (arg1 as type, arg2 as type...)
sub subname() |
| call that function | name (arg1, arg2) | &name | name($arg1, $arg2...) | variable=funcname( arg1..) "()" required when passing args. subname |
| return value | return(expression) =val of expression return(); = undefined fall off end of function = undefined |
value of last expression evaluated | return $retval; | Set funcname
sub does not return a value |
| how end function? | } | } | } | End Function End Sub |
| arrays start with 0/1? | 0 | 0 | 0 | 0 |
| require ; at line end | optional if complete statement formatted on line by itself | yes | yes, I think | no |
| string concatenation | string + string | string . string | string . string | string & string |
| require {} after if statements | no | yes | no | no |
| if syntax | if (expr) | if { ...} [{ is required]..endif | if (expr) | If ... End If |
| else if syntax | else if | elsif | elseif | ElseIf |
| how reference variables | variable | $variable | $variable | variable |
| equality test | == | == | == | = |
| comments | // to end of line OR
/* comment */ may span multiple lines, but cannot be nested |
# to end of line | // or # to end of line or end of PHP code block, whichever comes
first
/* comment */ may span multiple lines, but cannot be nested |
Rem or '
to comment multiple lines use the line continuation character, " _" |
| additional notes | Any numeric non-zero numeric value is TRUE, zero is FALSE. Be sure to note that negative values are non-zero and are thus considered TRUE! The empty string and the string "0" are FALSE; all other strings are TRUE. With non-scalar values (arrays and objects) - if the value contains no elements it's considered FALSE, otherwise it's considered TRUE. |
