What is the function to reverse string in php

php string reverse function "strrev()". The function of the strrev() function is to reverse a string and reverse the order of characters in the string; this function only accepts one required parameter "$string" for the reverse operation. The syntax "strrev($string)" will Returns the reversed string.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php string reversal function "strrev()".

strrev() function can reverse the string and reverse the order of characters in the string.

Syntax:

strrev($string)

Parameters	Description
string	Required. Specifies the string to reverse.

#This function only accepts one required parameter "$string" for the reverse operation.

• If the operation is successful, the reversed string will be returned.

Example: Reverse the string "Hello World!"

<?php
header("Content-type:text/html;charset=utf-8");
$str="Hello World!";
echo "原字符串：".$str."<br>";
echo "反转字符串：".strrev($str);
?>

Expand knowledge: Use the for statement substr( ) Splicing to achieve string reversal

Implementation idea:

• Use the for statement to traverse the string in reverse order

• Use the substr() function to intercept characters from back to front and splice them into a new string

Implementation example: reverse the string "abcdefg"

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="abcdefg";
echo "字符串反转前：<br>";
var_dump($str);

$result = &#39;&#39;;
$len = strlen($str);//获取字符串长度
for ($i = $len-1; $i>=0; $i--){
	$result.= substr($str,$i,1);
}
echo "字符串反转后：<br>";
var_dump($result);
?>

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