描述
mixed
count_chars ( string string [, int mode] )
統計 string
中每個位元組值（0..255）出現的次數，使用多種模式返回結果。可選參數
mode 預設值為
0。根據不同的
mode，count_chars()
返回下列不同的結果：
0 - 以所有的每個位元組值作為鍵名，出現次數作為值的陣列。
1 - 與 0 相同，但只列出出現次數大於零的位元組值。
2 - 與 0 相同，但只列出出現次數等於零的位元組值。
3 - 返回由所有使用了的位元組值組成的字串。
4 - 返回由所有未使用的位元組值組成的字串。
例子 1. count_chars() 示例
<?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";
}
?>
|
下邊為示例輸出：
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. |
|
參見 strpos() 和
substr_count()。
