How to delete the last character after output in php

php method to delete the last character after output: 1. Use the substr and strlen functions to delete the last character; 2. Directly use the substr function to trim the last character in reverse order; 3. Use rtrim to delete the string Terminal whitespace characters.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How to delete the last character after output in php ?

Summary of the three methods of deleting the last character of a string in PHP

1. Preface

Read from the database with select() When providing one-to-many information, it is often necessary to split the retrieved array with a specific character and then concatenate it into a string.

Common syntax format:

foreach ($arr as $key => $value) {2 $arr_str = $arr['x_id'] . ',' . $arr_str;3     }

Assume that the characters in the character array $arr are

arr[0] = 'a';2 arr[1] = 'b';3 arr[2] = 'c';

, then the spliced ​​$arr_str string is a, b, c , at this time, we need to delete the last character ','.

2. 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 strlen() The function determines the length of the string $arr_str, and then uses 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 3:      

rtrim($arr_str, ",")

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

rtrim - delete the end of the string Blank characters (or other characters)

Usage experience:

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!

Recommended learning: "PHP Video Tutorial"

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