Find characters that are lower case

[ziycon]

I have a string and want to find any character that is lower case, any ideas how to do this, is there a function that will decipher between upper and lower case?

[Dormilich]

use regular expressions. or maybe the unicode values. you could also compute the difference between original text and uppercased text.

[Atli]

I would go with a regular expression.
A simple "[a-z]" pattern used with the preg_match_all function should give you an array of all the lower case letters in a string.

[ziycon]

Ok, I'm not sure how to go about this, say I have the below string:

Agd3iKcTF

What i want to do is search for all the lower case characters and get there array element location so for the above string it would be:

1,2,4,6

But I need the string to be kept intact, all help appreciated.

[Dormilich]

then you need a RegEx.

preg_match_all('#[a-z]#', 'Agd3iKcTF', $match, PREG_OFFSET_CAPTURE);

technically, you could also loop through the string, but that’s far less efficient.

[hsriat]

$str = "ABcdeFgHI";
$result = array_keys(array_diff_assoc(str_split($str), str_split(strtolower($str))));

[EDIT: Solution by Dormilich is better.]