What is the way to delete the last character in php

How to delete the last character in php: You can use the rtrim function to delete, such as [rtrim($str)]. The rtrim function can remove whitespace characters or other predefined characters on the right side of a string and return the modified string.

Function used:

rtrim() function removes blank characters or other predefined characters on the right side of the string and returns Modified string.

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Example:

Remove spaces on the right side of the string:

<?php
$str = "Hello World!    ";
echo "不使用 rtrim：" . $str;
echo "<br>";
echo "使用 rtrim：" . rtrim($str);
?>

Remove the newline character (\n) on the right side of the string:

<?php
$str = "Hello World!\n\n\n";
echo "不使用 rtrim：" . $str;
echo "<br>";
echo "使用 rtrim：" . rtrim($str);
?>

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