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label for var ( list) block label for var ( list) block continue block label foreach var ( list) block label foreach var ( list) block continue block. In foreach, var is a scalar variable that defaults to $_ if omitted. For each element of list, var is aliased to the element, and the loop body is executed once.
^c In Perl, the "my" keyword scopes the variable into the block. ^d Technically, this does not declare name to be a mutable variable—in ML, all names can only be bound once; rather, it declares name to point to a "reference" data structure, which is a simple mutable cell.
Originally, filehandles could only be created with package variables, using the ALL_CAPS convention to distinguish it from other variables. Perl 5.6 and newer also accept a scalar variable, which will be set (autovivified) to a reference to an anonymous filehandle, in place of a named filehandle.
In the PHP language, which was largely inspired by Perl, "$" precedes any variable name. Names not prefixed by this are considered constants, functions or class names (or interface or trait names, which share the same namespace as classes). PILOT uses "$" for buffers (string variables), "#" for integer variables, and "*" for program labels.
Perl is a high-level, general-purpose, interpreted, dynamic programming language. ... However, unlike the shell, Perl uses sigils on all accesses to variables, and ...
Perl – high-level, general-purpose, ... In dynamic typing values have types, but variables do not; that is, a variable can refer to a value of any type.
Comparison of programming languages; General comparison; Assignment; Basic syntax; Basic instructions; Comments; Control flow Foreach loops; While loops; For loops
Perl 5.6.1 and newer support autovivification of file and directory handles. [3] Calling open() on an undefined variable will set it to a filehandle. According to perl561delta, "[t]his largely eliminates the need for typeglobs when opening filehandles that must be passed around, as in the following example: