如何删除 PHP 中字符串末尾的所有特定字符？

$output = rtrim($string, '.');

(Reference: rtrim on PHP.net)

using rtrim replaces all "." at the end, not just the last character

$string = "something here..";
echo preg_replace("/\.$/","",$string);

I know the question is some what old but may be my answer is helpful for someone.

$string = "something here..........";

ltrim would remove leading dots. for example:- ltrim($string, ".")

rtrim rtrim($string, ".") would remove trailing dots.

trim trim($string, ".") would remove trailing and leading dots.

you can also do this by regex

preg_replace would remove can be used to remove dot/dots at the end

$regex = "/\.$/"; //to replace single dot at the end
$regex = "/\.+$/"; //to replace multiple dots at the end
preg_replace($regex, "", $string);

I hope it is helpful for you.

To remove the last character only if it's a period and not resorting to preg_replace we can just treat the string as an array of char and remove the final character if it is a dot.

if ($str[strlen($str)-1]==='.')
$str=substr($str, 0, -1);

Example:

    $columns = array('col1'=> 'value1', 'col2' => '2', 'col3' => '3', 'col4' => 'value4');


echo "Total no of elements: ".count($columns);
echo "<br>";
echo "----------------------------------------------<br />";


$keys = "";
$values = "";
foreach($columns as $x=>$x_value)
{
echo "Key=" . $x . ", Value=" . $x_value;
$keys = $keys."'".$x."',";
$values = $values."'".$x_value."',";
echo "<br>";
}




echo "----------------------Before------------------------<br />";


echo $keys;
echo "<br />";
echo $values;
echo "<br />";


$keys   = rtrim($keys, ",");
$values = rtrim($values, ",");
echo "<br />";


echo "-----------------------After-----------------------<br />";
echo $keys;
echo "<br />";
echo $values;


?>

Output:

Total no of elements: 4
----------------------------------------------
Key=col1, Value=value1
Key=col2, Value=2
Key=col3, Value=3
Key=col4, Value=value4
----------------------Before------------------------
'col1','col2','col3','col4',
'value1','2','3','value4',


-----------------------After-----------------------
'col1','col2','col3','col4'
'value1','2','3','value4'

Use a combination of strrpos and substr to get the position of the last period character and remove it leaving all other characters intact:

$string = "something here.";


$pos = strrpos($string,'.');
if($pos !== false){
$output = substr($string,0,$pos);
} else {
$output = $string;
}


var_dump($output);


// $output = 'something here';

You can use rtrim function of php which allows you to trim the data which exist in last position.

For example :

$trim_variable= rtrim($any_string, '.');

Simplest and fasted way !!

The last character can be removed in different ways, Here are some

• rtrim()

$output = rtrim($string, '.');

• Regular Expression

preg_replace("/\.$/", "", $string);

• substr() / mb_substr()

echo mb_substr($string, 0, -1);


echo substr(trim($string), 0, -1);

• substr() with trim()

echo substr(trim($string), 0, -1);

I know the question is solved. But maybe this answer will be helpful for someone.

rtrim() - Strip whitespace (or other characters) from the end of a string

ltrim() - Strip whitespace (or other characters) from the beginning of a string

trim() - Strip whitespace (or other characters) from the beginning and end of a string

For removing special characters from the end of the string or Is the string contains dynamic special characters at the end, we can do by regex.

preg_replace - Perform a regular expression search and replace

$regex = "/\.$/";             //to replace the single dot at the end
$regex = "/\.+$/";            //to replace multiple dots at the end
$regex = "/[.*?!@#$&-_ ]+$/"; //to replace all special characters (.*?!@#$&-_) from the end


$result = preg_replace($regex, "", $string);

Here is some example to understand when $regex = "/[.*?!@#$&-_ ]+$/"; is applied to string

$string = "Some text........"; // $resul -> "Some text";
$string = "Some text.????";    // $resul -> "Some text";
$string = "Some text!!!";      // $resul -> "Some text";
$string = "Some text..!???";   // $resul -> "Some text";

I hope it is helpful for you.

Thanks :-)

The chop() function removes whitespaces or other predefined characters from the right end of a string

$string = "something here.";


$string = chop($string,".");


echo $string;

Output

something here