How to remove the last four digits of a string in PHP?

#How to remove the last four digits of a string in PHP?

In PHP, you can use the "substr()" function to remove the last four digits of a string. This function will return the substring of the string. Its syntax is "substr(str,start,length)" , when using, pass the string to be operated on to the parameter str, start is 0, and length is the length of the string minus 4.

Sample code

 
<? 
echo substr("abcdef", 1, 3); // 返回 "bcd" 
echo substr("abcdef", -2); // 返回 "ef" 
echo substr("abcdef", -3, 1); // 返回 "d" 
echo substr("abcdef", 1, -1); // 返回 "bcde" 
?>

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

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