How to reverse string abcdefg in php

Reversal method: 1. Use the strrev() function, the syntax is "strrev("abcdefg")"; 2. Use the for statement and substr(), the syntax "for($i=string length- 1;$i>=0;$i--){$r.=substr("abcdefg",$i,1);}".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php reverse characters String "abcdefg"

Method 1: Use the string reversal function strrev()

PHP provides a large number of methods for processing strings Built-in functions, for example, if you want to reverse a string, you can use the strrev() function.

strrev() function reverses a string and returns the reversed string.

Example: Reverse the string "abcdefg"

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

##Method 2: Use for statement and substr() to splice

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

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

<?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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