How can I get the last 7 characters of a PHP string?
PhpStringPhp Problem Overview
How would I go about grabbing the last 7 characters of the string below?
For example:
$dynamicstring = "2490slkj409slk5409els";
$newstring = some_function($dynamicstring);
echo "The new string is: " . $newstring;
Which would display:
The new string is: 5409els
Php Solutions
Solution 1 - Php
Use substr() with a negative number for the 2nd argument.
$newstring = substr($dynamicstring, -7);
From the php docs:
>string substr ( string $string , int $start [, int $length ] )
>
>If start is negative, the returned string will start at the start'th character from the end of string.
Solution 2 - Php
umh.. like that?
$newstring = substr($dynamicstring, -7);
Solution 3 - Php
Safer results for working with multibyte character codes, allways use mb_substr instead substr. Example for utf-8:
$str = 'Ne zaman seni düşünsem';
echo substr( $str, -7 ) . ' <strong>is not equal to</strong> ' .
mb_substr( $str, -7, null, 'UTF-8') ;
Solution 4 - Php
It would be better to have a check before getting the string.
$newstring = substr($dynamicstring, -7);
if characters are greater then 7 return last 7 characters else return the provided string.
or do this if you need to return message or error if length is less then 7
$newstring = (strlen($dynamicstring)>=7)?substr($dynamicstring, -7):"message";
Solution 5 - Php
For simplicity, if you do not want send a message, try this
$new_string = substr( $dynamicstring, -min( strlen( $dynamicstring ), 7 ) );
Solution 6 - Php
for last 7 characters
$newstring = substr($dynamicstring, -7);
$newstring : 5409els
for first 7 characters
$newstring = substr($dynamicstring, 0, 7);
$newstring : 2490slk
Solution 7 - Php
There are multiple correct answers here. But it isn't obvious what is needed, if you want a "safe" version of substr,
Same as substr, when the string is "long enough", but if the string is too short, return the original string (instead of returning false).
/** Unlike substr, handles case where $string is too short.
* @param $string
* @param $nChars - negative to return at end of string.
*/
function safe_substr($string, $nChars) {
if ($nChars == 0 || !isset($string))
return "";
if (strlen($string) <= abs($nChars))
// $string is too short (or exactly the desired length). Return the string.
return $string;
return substr($string, $nChars);
}
NOTE: FOR UTF-8 chars, define safe_mb_substr, replacing substr above with mb_substr. And replace strlen with mb_strlen.
Solution 8 - Php
last 7 characters of a string:
$rest = substr( "abcdefghijklmnop", -7); // returns "jklmnop"