PHP Conference China 2020

strrev

(PHP 4, PHP 5, PHP 7)

strrev反转字符串

说明

strrev ( string $string ) : string

返回 string 反转后的字符串。

参数

string

待反转的原始字符串。

返回值

返回反转后的字符串。

范例

Example #1 使用 strrev() 反转字符串

<?php
echo strrev("Hello world!"); // 输出 "!dlrow olleH"
?>

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User Contributed Notes 3 notes

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13
tianyiw at vip dot qq dot com
2 years ago
This function support utf-8 encoding, Human Language and Character Encoding Support:

<?php
function mb_strrev($str){
   
$r = '';
    for (
$i = mb_strlen($str); $i>=0; $i--) {
       
$r .= mb_substr($str, $i, 1);
    }
    return
$r;
}

echo
mb_strrev("☆❤world"); // echo "dlrow❤☆"
?>
up
1
info at ensostudio dot ru
29 days ago
<?php
/**
* Reverse a miltibyte string.
*
* @param string $string The string to be reversed.
* @param string|null $encoding The character encoding. If it is omitted, the internal character encoding value
*     will be used.
* @return string The reversed string
*/
function mb_strrev(string $string, string $encoding = null): string
{
   
$chars = mb_str_split($string, 1, $encoding ?: mb_internal_encoding());
    return
implode('', array_reverse($chars));
}
?>
It's faster and flexible than tianyiw function (comment #122953)
up
-27
arturklesun at gmail dot com
2 years ago
Be careful, it does not work with unicode strings.

<?php
php
> $str = '1¥';
php > print($str);

php
> print(strrev($str));
��1
?>
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