Podręcznik PHP
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# count_chars

(PHP 4 )

count_chars -- Return information about characters used in a string

## Description

mixed count_chars ( string string [, int mode])

Counts the number of occurrences of every byte-value (0..255) in `string` and returns it in various ways. The optional parameter `mode` default to 0. 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 used byte-values is returned.

- 4 - a string containing all not used byte-values is returned.

Przykład 1. count_chars() example
`<?php $data = "Two Ts and one F."; $result = count_chars($data, 0); for ($i=0; $i < count($result); $i++) { if ($result[$i] != 0) echo "There were $result[$i] instance(s) of \"" , chr($i) , "\" in the string.\n"; } ?>`
This 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() and substr_count().

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