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strrev

(PHP 4, PHP 5, PHP 7, PHP 8)

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。

示例

示例 #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

down

info at ensostudio dot ru ¶

3 years 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)

down

tianyiw at vip dot qq dot com ¶

5 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❤☆"
?>

down

-9

manoj904378 at gmail dot com ¶

2 years ago

Inside of String Reverse  strrev()
--------------------------   -------
<?php
$string = 'This is manoj';
$n =strlen("$string");
For($i=1;$i<=$n;$i++)
{
    $val= $string[-$i];
   echo $val;
}
?>

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