Counts the number of occurrences of every bytevalue (0..255) in string and returns it in various ways. Test count_chars online.
mixed count_chars ( string $string [, int $mode = 0 ] )
PHP Documentation by the PHP Documentation Group
(PHP 4, PHP 5, PHP 7, PHP 8)
count_chars — Return information about characters used in a string
$string
, int $mode
= 0
) : arraystring
Counts the number of occurrences of every bytevalue (0..255) in
string
and returns it in various ways.
string
The examined string.
mode
See return values.
Depending on mode
count_chars() returns one of the following:
Version  Description 

8.0.0 
Prior to this version, the function returned false on failure.

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.
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