count_chars
PHP 4, PHP 5, PHP 7, PHP 8
count_chars - Return information about characters used in a string
count_chars(
string$string,
[int$mode = 0] ): array|string
Counts the number of occurrences of every byte-value (0..255) in string and returns it in various ways.
Parameters
- string
-
The examined string.
- mode
-
See return values.
Return Values
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.
Changelog
| Version | Description |
| 8.0.0 | Prior to this version, the function returned false on failure. |