How to get last n characters of PHP string

Write a PHP program to get the last n characters of a given string.

Example:

输入: $str = "HTML!CSS!MySQL!PHP!"
        $n = 4 
输出: PHP!

输入: $str = "HTML!CSS!MySQL!PHP!"
        $n = 10
输出: MySQL!PHP!

Method 1: In this method, iterate over the last N characters of the string and continue adding them appended to a new string.

Example:

<?php 
  
$str = "HTML!CSS!MySQL!PHP!"; 
$n = 4; 
  
$start = strlen($str) - $n;   
$str1 = &#39;&#39;;   
for ($x = $start; $x < strlen($str); $x++) {   
    $str1 .= $str[$x]; 
} 
  
echo $str1; 
?>

Output:

PHP!

Method 2: Another method is to use the built-in library function substr, where the parameter is a string name.

Example:

<?php 
  
$str = "HTML!CSS!MySQL!PHP!"; 
$n = 10;   
$start = strlen($str) - $n; 
$str1 = substr($str, $start); 
  
echo $str1; 
?>

Output:

MySQL!PHP!

Note: In the above example, $start can also use -N to create the last n A substring of characters.

Related recommendations: "PHP Tutorial"http://www.php.cn/course/list/29.html

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