perl - 在 Perl 中如何获取字符串的长度？

Question

strlen() 的 Perl 等价物是什么？

Answer 1

长度($字符串)

perldoc -f length   length EXPR   length  Returns the length in characters of the value of EXPR.  If EXPR is           omitted, returns length of $_.  Note that this 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.           Note the characters: if the EXPR is in Unicode, you will get the num-           ber of characters, not the number of bytes.  To get the length in           bytes, use "do { use bytes; length(EXPR) }", see bytes.