substr PHP removes the last character of a string with substr usage

Used in today's project to remove the last character in a string
The original string 1,2,3,4,5,6,
Remove the last character "," and the end result is 1,2,3,4,5,6
The code is as follows:

Copy the Code code as follows:

$str = "1,2,3,4,5,6,";
$newstr = substr ($str, 0,strlen ($STR)-1);
Echo $newstr;

Interpretation:
Using PHP's Substr () method,
Syntax: String substr (string string, int start, int [length]);
Parameter 1: the original string;
Parameter 2: The starting position of the cutting;
Parameter 3: Length of interception;
Use this as follows:
$newstr = substr ($str, 0,strlen ($STR)-1);
Intercept from the beginning, always intercept to the penultimate, so that the final "," removed.
The system comes with functions that can also achieve this effect, two methods:
1) substr ($str, 0,-1)
2) RTrim ($str, ",")
Substr
Takes a partial string.
Syntax: String substr (string string, int start, int [length]);
return value: String
Function type: Data processing
Content Description
This function takes the string starting at the start of the string to take a length character. If start is negative, it is counted from the end of the string. If the omitted parameter length exists, but is a negative number, it is taken to the penultimate length character.
Usage examples

Copy the Code code as follows:

echo substr ("abcdef", 1, 3); Returns "BCD"
echo substr ("ABCdef",-2); Back to "EF"
echo substr ("ABCdef",-3, 1); Return "D"
echo substr ("abcdef", 1,-1); Back to "BCDE"
?>

PHP RTrim () function
Definition and usage
The RTrim () function removes whitespace characters or other predefined characters starting at the end of the string. The same chop () function.
Grammar

Parameters	Description
String	Necessary. Specifies the string to convert.
Charlist	Optional. Specifies which characters are removed from the string. If this parameter is not set, all of the following characters are removed: "+"-ASCII 0, NULL "\ T"-ASCII 9, tab "\ n"-ASCII 10, New line "\X0B"-ASCII 11, Vertical tab "\ r"-ASCII 13, enter ""-ASCII 32, space

Usage examples

The above describes the substr php to remove the last character of the string with substr usage, including the substr aspect of the content, I hope that the PHP tutorial interested in a friend helpful.

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