length

length

length EXPR

length

Returns the length in characters of the value of EXPR. If EXPR is omitted, returns the length of $_ . If EXPR is undefined, returns undef-

This function cannot be used on an entire array or hash to find out how many elements these have- For that, use scalar @array and scalar keys %hash , respectively.

Like all Perl character operations, length() normally deals in logical characters, not physical bytes. For how many bytes a string encoded as UTF-8 would take up, use 登录查看完整内容