Control Statements

JavaScript

Variables declared in blocks are not local.

if (control_expression)
    single_or_compound_statement
[else
    single_or_compound_statement]

switch(expression)
{
    case value1:
        statement_sequence_or_compound_statement
    case value2:
        statement_sequence_or_compound_statement
    ...
    [default:
        statement_sequence_or_compound_statement]
}

Note that in a JavaScript switch statement, the control expression may evaluate to a number, string, or boolean value. The case values may therefore also be numbers, strings, or boolean values, and they don't all have to be the same kind of value.

while (control_expression)
    statement_sequence_or_compound_statement

do
    statement_sequence_or_compound_statement
while (control_expression);

for (init_expr; control_exp; increment_or_decrement_expression)
    statement_sequence_or_compound_statement

In the above for-statement both multiple expressions and (global) declarations are possible.

for (var someVariable in someObject)
    statement_sequence_or_compound_statement

PHP

PHP has ...

Perl

Perl has ...