array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'ja', ), 'this' => array ( 0 => 'function.count-chars.php', 1 => 'count_chars', ), 'up' => array ( 0 => 'ref.strings.php', 1 => 'String 関数', ), 'prev' => array ( 0 => 'function.convert-uuencode.php', 1 => 'convert_uuencode', ), 'next' => array ( 0 => 'function.crc32.php', 1 => 'crc32', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'ja', 'path' => 'reference/strings/functions/count-chars.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 4, PHP 5, PHP 7, PHP 8)
count_chars — 文字列で使用されている文字に関する情報を返す
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。
string
調べたい文字列。
mode
戻り値を参照ください。
mode
の値により、
count_chars() は以下の値のどれかを返します。
バージョン | 説明 |
---|---|
8.0.0 |
これより前のバージョンでは、この関数は失敗時に false を返していました。
|
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.