count_chars
(PHP 4, PHP 5, PHP 7, PHP 8)
count_chars — Return information about characters used in a string
Description
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.
|
Examples
Example #1 count_chars() example
<?php
$data = "Two Ts and one F.";
foreach (count_chars($data, 1) as $i => $val) {
echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}
?>
The above example will output:
There were 4 instance(s) of " " in the string. There were 1 instance(s) of "." in the string. There were 1 instance(s) of "F" in the string. There were 2 instance(s) of "T" in the string. There were 1 instance(s) of "a" in the string. There were 1 instance(s) of "d" in the string. There were 1 instance(s) of "e" in the string. There were 2 instance(s) of "n" in the string. There were 2 instance(s) of "o" in the string. There were 1 instance(s) of "s" in the string. There were 1 instance(s) of "w" in the string.
See Also
- strpos() - Find the position of the first occurrence of a substring in a string
- substr_count() - Count the number of substring occurrences
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