How to find string length in php with out using strlen()? - php

Question

How can you find the length of a string in php with out using strlen() ?

Answer 1

I know this is a pretty old issue, but this piece of code worked for me.
$s = 'string';
$i=0;
while ($s[$i] != '') {
$i++;
}
print $i;

Answer 2

$inputstring="abcd";
$tmp = ''; $i = 0;
while (isset($inputstring[$i])){
$tmp .= $inputstring[$i];
$i++;
}
echo $i; //final string count
echo $tmp; // Read string
while - Iterate the string character 1 by 1
$i - gives the final count of string.
isset($inputstring[$i]) - check character exist(null) or not.

Answer 3

I guess there's the mb_strlen() function.
It's not strlen(), but it does the same job (with the added bonus of working with extended character sets).
If you really want to keep away from anything even related to strlen(), I guess you could do something like this:
$length = count(str_split($string));
I'm sure there's plenty of other ways to do it too. The real question is.... uh, why?

Answer 4

Lets be silly
function stupidCheck($string)
{
$count = 0;
for($i=0; $i<66000; $i++)
{
if(#$string[$i] != "")$count++;
else break;
}
return $count;
}

Answer 5

Simply you can use the below code.
<?php
$string="Vasim";
$i=0;
while(isset($string[$i]))
{
$i++;
}
echo $i; // Here $i has length of string and the answer will be for this string is 5.
?>

Answer 6

The answer given by Vaibhav Jain will throw the following notice on the last index.
Notice: Uninitialized string offset
I would like to give an alternative for this:
<?php
$str = 'India';
$i = 0;
while(#$str[$i]) {
$i++;
}
echo 'Length of ' . $str . ' is ' . $i . '.';

Answer 7

mb_strlen — Get string length
$string ='test strlen check';
print 'mb_strlen(): ' . mb_strlen( $string, 'utf8' ) . "\n\n";
synatx: int mb_strlen ( string $str [, string $encoding = mb_internal_encoding() ] )
str - The string being checked for length.
encoding - The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.

Answer 8

In newer PHP versions, you can use null coalescing operator to achieve this.
<?php
$string = 'test';
for($i = 0; ($string[ $i] ?? false) !== false; ++$i);
echo $i;// outputs length of the string.
Online Demo

Answer 9

You could also cheat with something like:
print strtok(substr(serialize($string), 2), ":");
Or this one is quite amusing:
print array_sum(count_chars($string));

Answer 10

function mystrlen($str)
{
$i = 0;
while ($str != '')
{
$str = substr($str, 1);
$i++;
}
return $i;
}

Answer 11

function findStringLength($string) {
$length = 0;
$lastStringChar1 = '1';
$lastStringChar2 = '2';
$string1 = $string . $lastStringChar1;
$string2 = $string . $lastStringChar2;
while ($string1[$length] != $lastStringChar1 || $string2[$length] != $lastStringChar2) {
$length++;
}
return $length;
}

Answer 12

You can use this code for finding string length without using strlen() function.
<?php
function stringlength($withoutstringlength)
{
$n = 0;
while(substr($withoutstringlength, $n, $n+1) != '')//General syntax substr(string,start,length)
{
$n++;
}
echo $n;
}
stringlength("i am a php dev");
?>

Answer 13

Try this:
function length($value){
if(empty($value[1])) return 1;
$n = 0;
while(!empty($value[$n+1])){
$n++;
}
return $n+1;
}

Answer 14

This doesn't use loops but may face the O(n) issue if strrpos uses strlen internally.
function length($str)
{
return strrpos($str.'_', '_', -1);
}

Answer 15

function my_strlen($str)
{
for($i=-1; isset($str[++$i]); );
return $i;
}
echo my_strlen("q");

Answer 16

$str = "Hello World";
$count= 0;
while( isset($str[$count]) && $str[$count] ) {
$count++;
}
echo $count;
OUTPUT:
11

Answer 17

Renverser un charactère sans Function
class StringFunction {
public function strCount($string) {
$cpt=0;
//isset pour cacher l'erreur
// Notice: Uninitialized string offset
while(isset($string[$cpt])) {
$cpt++;
}
return $cpt;
}
public function reverseChar($str) {
//mes indexes
$start = 0;
$end = $this->strCount($str)-1;
//Si $start est inférieur à $end
while ($start < $end) {
//change position du charactère
$temp = $str[$start];
$str[$start] = $str[$end];
$str[$end] = $temp;
$start++;
$end--;
}
return $str;
}
}
$string = "Bonjour";
$a = new StringFunction();
echo $string . "<br>";
echo $a->reverseChar($string);

Answer 18

This code will help you when you don't want to use any inbuilt function of php.
You can test this here also
http://phptester.net/
<?php
$stings="Hello how are you?";
$ctr=0;
while(1){
if(empty($stings[$ctr])){
break;
}
$ctr++;
}
echo $ctr;

Answer 19

<?php
$str = "aabccdab";
$i = 0;
$temp = array();
while(isset($str[$i])){
echo $str[$i];
$count = 0;
if(isset($temp[$str[$i]])){
$temp[$str[$i]] = $temp[$str[$i]]+1;
}else{
$temp[$str[$i]] = 1;
}
$i++;
}
print_r($temp);
?>

Answer 20

It's going to be a heavy work for your server, but a way to handle it.
function($string){
$c=0;
while(true){
if(!empty($string[$c])){
$c=$c+1;
} else {
break; // Prevent errors with return.
}
}
return $c;
}

Answer 21

$str = "STRING";
$i=0; $count = 0;
while((isset($str{$i}) && $str{$i} != "")){
$i++; $count++;
}
print $count;

Answer 22

This can also help -
$s = 'string';
$temp = str_split($s); // Convert a string to an array by each character
// if don't want the spaces
$temp = array_filter($temp); // remove empty values
echo count($temp); // count the number of element in array
Output
6

Answer 23

<?php
$arr = array('vadapalanai','annanager','chennei','salem','coimbatore');
$min = $arr[0];
$max = $arr[0];
foreach($arr as $key => $val){
if (strlen($min) > strlen($val)) {
$min = $val ;
}
if(strlen($max) < strlen($val)){
$max = $val;
}
}
echo "The shortest array length is : " .$min. " ".strlen($min);
echo "<br>";
echo "The longest array length is: " .$max. " ".strlen($max);
?>

Answer 24

$str = 'I am XYZ'
$count = 0;
$i=0;
while (isset($str[$i])) {
$count = $i;
$i++;
}
echo $count;