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how to Find string length without white spaces and functions in php

Solution:1

You can use regular expressions and the function preg_match_all:

$value = "This is a test string.";
$length = preg_match_all ('/[^ ]/' , $value, $matches);
echo $length; //18

Here you can find a working example: https://3v4l.org/IPlJi

explanation:
Between [^ and ] you have to add all characters which should not be count to the length of the string. For example: if you want to filter out the character i and (space) you have to set the following pattern: [^ i].

Code to filter i and (space):

$value = "This is a test string.";
$length = preg_match_all('/[^ i]/' , $value, $matches);
echo $length; //15

be carefull with some characters:
If you want to exclude one of the following characters .^$*+?()[{\| you have to escape them with \. If you want to exclude the . too, you have the following code:

$value = "This is a test string.";
$length = preg_match_all ('/[^ \.]/' , $value, $matches);
echo $length; //18

how to test your pattern:
If you want to test your regular expressions for preg_match_all or other functions like that, you can use the following tool: http://www.phpliveregex.com/

Solution:2

<!doctype html>
<html>
  <body>
    <center>
      <form action="#" method="get">
        <br>
        <input type="text" name="txt"/>
        <br><br>
        <input type="submit" name="submit"/>
        <br><br>
      </form>
      <!---------------------------------------------------------------------->  
<?php
if(isset($_GET["submit"])) {
    $name = $_GET["txt"];
    for ($i = 0; isset($name[$i]); $i++) {
        $j = $i;
    }
    for ($k = $j; isset($name[$k]); $k--) {
        echo $name[$k];
    }
}