How to sort strings in reverse direction in PHP

Method: 1. Use the strrev() function to reverse the string. 2. First use str_split() to split the string into an array, then use array_reverse() to reverse the order of the elements in the array, create a new array and return it; finally use the implode() function to convert the new array into a string.

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

Method 1: Use strrev() Function

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

Example:

<?php
echo strrev("Hello World!");
?>

Output:

!dlroW olleH

Method 2: Using str_split() array_reverse() implode() function

First use the str_split() function to split the string into an array, then use the array_reverse() function to reverse the order of the elements in the original array, create a new array and return it; finally use the implode() function to convert the new array is a string.

<?php
$str = 'hello world!';
$arr1 = str_split($str);
$arr2 = array_reverse($arr1);
$str = implode($arr2);
echo $str;
?>

Output

!dlroW olleH

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