String 関数
PHP Manual

count_chars

(PHP 4, PHP 5, PHP 7)

count_chars文字列で使用されている文字に関する情報を返す

説明

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

string において各バイト値 (0..255) が存在する数をかぞえ、様々な手法で返します。

パラメータ

string

調べたい文字列。

mode

返り値を参照ください。

返り値

mode の値により、 count_chars() は以下の値のどれかを返します。

例1 count_chars() の例

<?php
$data 
"Two Ts and one F.";

foreach (
count_chars($data1) as $i => $val) {
   echo 
"There were $val instance(s) of \"" chr($i) , "\" in the string.\n";
}
?>

上の例の出力は以下となります。

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.

参考


String 関数
PHP Manual