PHP function count_chars()
Availability in PHP 4.0
Return information about characters used in a string
Parameters
| Parameter | Data type | Default value | Note |
|---|---|---|---|
$string |
string |
not | The examined string. |
$mode |
int |
null | See return values. |
Return values
mixed
Depending on mode count_chars returns one of the following: 0 - an array with the byte-value as key and the frequency 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 unique characters is returned. 4 - a string containing all not used characters is returned.