How to remove the last few characters of a string in php

Removal method: 1. Use the rtrim() function, the syntax is "rtrim(string, character)"; 2. Use the chop() function, the syntax is "chop(string, character)"; 3. Use substr() function, syntax "substr(string,0,-n)", parameter n specifies the number of characters to be removed.

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

Method 1: Use rtrim() function

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

Output:

Hello World!
Hello

Description:

rtrim() function from string Starting from the end, whitespace characters or other predefined characters are removed. The syntax is as follows:

rtrim(string,charlist)

##ParameterDescriptionRequired. Specifies the string to check. Optional. Specifies which characters are removed from a string. If this parameter is omitted, all of the following characters are removed:

string
charlist	"\0" - NULL "\t" - Tab "\n" - Newline "\x0B" - vertical tab "\r" - carriage return " " - space

Method 2: Use chop() function

<?php
$str = "Hello World";
echo $str . "<br>";
echo chop($str,"World");
?>

Output:

Hello World
Hello

Description:

chop() function removes blank characters or other predefined characters at the right end of the string. The syntax is as follows:

chop(string,charlist)

Parameter description is the same as the rtrim() function.

Method 3: Use substr() function

<?php
$str = "Hello World!";
echo $str . "<br>";
echo substr($str,0,-5);
?>

Output:

Hello World!
Hello W

Instructions:

substr() function returns a part of a string. The syntax is as follows:

substr(string,start,length)

##Parameterstringstartlength Note: If the start parameter is negative and length is less than or equal to start, length is 0.

Description
Required. Specifies a part of the string to be returned.
Required. Specifies where in the string to begin.	Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - at the first character in the string Start at
Optional. Specifies the length of the string to be returned. The default is until the end of the string.	Positive number - Returns from the position of the start parameter Negative number - Returns from the end of the string

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