Description
mixed count_chars (string string [, mode])
Counts the number of occurances of every byte-value (0..255) in
string and returns it in various ways.
The optional parameter Mode default to
0. Depending on mode
count_chars() returns one of the following:
0 - an array with the byte-value as key and the freqency of
every byte as value.
1 - same as 0 but only byte-values with a frequency greater
than zero are listed.
2 - same as 0 but only byte-values with a frequency equal to
zero are listed.
3 - a string containing all used byte-values is returned.
4 - a string containing all not used byte-values is returned.
Note:
This function was added in PHP 4.0.
Manual: count_chars
