How to remove trailing characters in php

php method to remove tail characters: 1. Remove the tail characters through the "substr($arr_str,0,strlen($arr_str)-1);" statement; 2. Use "substr($arr_str, 0, -1)" statement to remove the trailing characters; 3. Delete the specified characters at the end of the string through rtrim, the syntax is "rtrim($arr_str, "specified character")".

The operating environment of this tutorial: Windows 7 system, PHP 8 version, Dell G3 computer.

Summary of the method of deleting the last character in PHP:

Method 1:

substr($arr_str,0,strlen($arr_str)-1);

Detailed explanation:

substr() function syntax: string substr (string $string, int $start [, int $length])

strlen() function syntax: int strlen (string $string)

Principle of this example:

First, use the strlen() function to determine the length of the string $arr_str, and then use the substr() function to intercept $arr_str to the penultimate digit of $arr_str. This removes the last ",".

Usage experience:

Not recommended, there is a simpler and more useful way in PHP!

Method 2:

substr($arr_str, 0, -1)

Detailed explanation: directly use the substr() function to cut off the last character in reverse order;

Usage experience: It is still very suitable ~~However, first you have to make sure that there must be content in the string, and the last digit must not be included!

Method three:

rtrim($arr_str, ",")

Detailed explanation: rtrim() function syntax: string rtrim ( string $str [, string $character_mask ] )

rtrim — Delete the blank characters (or other characters) at the end of the string

Usage experience:

It is simply prepared for this need!

Note: After the above method operates on the string, it returns the operation result and does not change the string itself! Remember to use a variable to receive the result!

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