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# count_chars

count_chars -- Return information abouts characters used in a string.

## Description

`mixed count_chars`(string string, [mode] );

Counts the number of occurances 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 freqency of every byte as value.

- 1 - same as 0 but only byte-values with a frequency greater 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.

> Note: This function was added in PHP 4.0.

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