How to remove the last character from php string

How to delete the last character in a php string: First create a PHP sample file; then use the "substr($str,0,strlen($str)-1);" method to delete the last character in the specified string Just delete the last character.

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php Remove the last character of the string

Original string 1,2,3,4,5,6,

Remove the last character ",", the final result is 1,2,3,4,5,6

The code is as follows:

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

The function that comes with the system can achieve this effect, two methods:

substr($str, 0, -1)
//函数2
rtrim($str, ",")

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