How to remove leading and trailing spaces from a string in php

php method to remove spaces at the beginning and end of a string: 1. Use the trim() function to remove spaces at both ends of the string, the syntax is "trim (string)"; 2. Use rtrim() and ltrim() The function removes spaces on the right and left sides of the string respectively, with the syntax "rtrim(string)" and "ltrim(string)".

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

php remove string Leading and trailing spaces

Method 1: Use the trim() function

trim() function to remove whitespace characters or other prefixes on both sides of the string Define characters.

Example:

<?php
$str = " Hello World! ";
echo "原字符串：" . $str;
echo "<br>";
echo "去除空格后的字符串: " . trim($str);
?>

Output:

原字符串: Hello World!
去除空格后的字符串: Hello World!

Method 2: Using rtrim() and ltrim() functions

## The #rtrim() function removes whitespace characters or other predefined characters from the right side of a string.

ltrim() function removes whitespace characters or other predefined characters on the left side of a string.

Example:

<?php
$str = "Hello World! ";
echo "原字符串: " . $str;
echo "<br>";
echo "去除空格后的字符串: " . rtrim(ltrim($str));
?>

Output:

原字符串: Hello World!
去除空格后的字符串: Hello World!

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