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php method to delete the last character: 1. Use "substr($arr_str,0,strlen($arr_str)-1);" to delete; 2. Use "substr($arr_str, 0, -1) ) method to delete; 3. Delete through the "rtrim" method.
The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer
Three ways to delete the last character of a string in PHP programs
Common syntax format:
foreach ($arr as $key => $value) { $arr_str = $arr['x_id'] . ',' . $arr_str; }
Assume that the characters in the character array $arr are
arr[0] = 'a'; arr[1] = 'b'; arr[2] = 'c';
Then, the spliced $arr_str string is a, b, c. At this time, we need to delete the last character ','.
Delete in two php Summary of the method for the last character:
Method 1:
substr($arr_str,0,strlen($arr_str)-1);
Detailed explanation: substr() function syntax: string substr ( string $string , int $start [, int $length ] )
Strlen () Function: Int Strlen (String $ String)
This Example Principle:
## First use the strlen () function to determine the length of the character string $ arr_str, and then use it to use The substr() function intercepts $arr_str to the penultimate digit of $arr_str. This removes the last ",". Usage experience: Not recommended, php There is a simpler and more useful way! Method 2:substr($arr_str, 0, -1)Detailed explanation: directly use the substr() function to cut off the last character in reverse order; Use Feeling: It’s still very appropriate~~ However, first you have to make sure that there must be content in the string, and the last digit must be missing! Method 3:
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
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