Return information about characters used in a string

Descrierea

count_chars ( string $string [, int $mode = 0 ] ) : mixed

Counts the number of occurrences of every byte-value (0..255) in string and returns it in various ways.

Parametri

string: The examined string.
mode: See return values.

Valorile întoarse

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.

Exemple

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";
}
?>

Exemplul de mai sus va afișa:

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.

A se vedea și

strpos() - Find the position of the first occurrence of a substring in a string
substr_count() - Count the number of substring occurrences