PHP Manual»String Функції»count_chars

count_chars

(PHP 4, PHP 5, PHP 7, PHP 8)

count_chars — Return information about characters used in a string

Опис

function count_chars(string $string, int $mode = 0): array|string

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

Параметри

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

Значення, що повертаються

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 unused characters is returned.

Журнал змін

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

Приклади

Приклад #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";
}
?>

Поданий вище приклад виведе:

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.

Прогляньте також

strpos() - Знаходить позицію першого входження підрядка в рядку
substr_count() - Count the number of substring occurrences