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count_chars

(PHP 4, PHP 5)

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] )

string において各バイト値(0..255)が存在する数 を数え、様々な手法で返します。 オプションの引数 mode のデフォルトは0です。 mode により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($data, 1) 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.

strpos(), substr_count() も参照ください。