检查长度至少为1个字符的字符串

Question

I often see strlen used. Are these 2 tests equivalent for all values of $str?

is_string($str) && 0 !== strlen($str)

is_string($str) && '' !== $str

Answer 1

Yes, those two statements are logically equivalent. My preferred ways to skin this cat:

is_string($str) && !empty($str)

...though empty('0') is true (sigh, PHP...), so this is probably even better:

$str !== ''

See also: Checking if the string is empty and Is there a difference between $str == '' and strlen($str) == 0 in PHP?