Return information about characters used in a string (original) (raw)

count_chars

(PHP 4, PHP 5, PHP 7)

count_chars — Return information about characters used in a string

Description

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

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.

Examples

Example #1 count_chars() example

`<?php
$data = "Two Ts and one F.";

foreach (

count_chars($data, 1) as i=>i => i=>val) {
echo "There were valinstance(s)of"¨,chr(val instance(s) of &quot;" , chr(valinstance(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