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(PHP 4, PHP 5, PHP 7, PHP 8)
count_chars — 返回字符串所用字符的信息
$string, int $mode = 0): array|string
统计 string
中每个字节值（0..255）出现的次数，使用多种模式返回结果。
string
需要统计的字符串。
mode
参见返回的值。
根据不同的 mode，count_chars()
返回下列不同的结果：
| 版本 | 说明 |
|---|---|
| 8.0.0 |
在此版本之前，函数在失败时返回 false。
|
示例 #1 count_chars() 示例
<?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";
}
?>
以上例程会输出：
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.
