SunshinePHP Developer Conference 2015

count_chars

(PHP 4, PHP 5)

count_charsRestituisce informazioni sui caratteri usati in una stringa

Descrizione

mixed count_chars ( string $string [, int $mode = 0 ] )

La funzione conta il numero di occorrenze di ogni valore dei byte (0..255) nella stringa string e li restituisce in vari modi.

Elenco dei parametri

string

La stringa esaminata.

mode

Vedere i valori restituiti.

Valori restituiti

A seconda di mode count_chars() restituisce uno dei seguenti:

  • 0 - un array con il valore del byte come chiave e la frequenza di ogni byte come valore.
  • 1 - stesso di 0 ma vengono elencati solo i valori dei byte con una frequenza maggiore di zero.
  • 2 - stesso di 0 ma vengono elencati solo i valori dei byte con una frequenza uguale a zero.
  • 3 - viene restituita una stringa contenente tutti i caratteri unici.
  • 4 - viene restituita una stringa contenente tutti i caratteri non utilizzati.

Esempi

Example #1 Esempio di count_chars()

<?php
$data 
"Two Ts and one F.";

foreach (
count_chars($data1) as $i => $val) {
   echo 
"Vi sono $val istanze di \"" chr($i) , "\" nella stringa.\n";
}
?>

Il precedente esempio visualizzerà:

Vi sono 4 istanze di " " nella stringa. 
Vi sono 1 istanze di "." nella stringa. 
Vi sono 1 istanze di "F" nella stringa. 
Vi sono 2 istanze di "T" nella stringa. 
Vi sono 1 istanze di "a" nella stringa. 
Vi sono 1 istanze di "d" nella stringa. 
Vi sono 1 istanze di "e" nella stringa. 
Vi sono 2 istanze di "n" nella stringa. 
Vi sono 2 istanze di "o" nella stringa. 
Vi sono 1 istanze di "s" nella stringa. 
Vi sono 1 istanze di "w" nella stringa. 

Vedere anche:

  • strpos() - Trova la posizione della prima occorrenza di una stringa
  • substr_count() - Conta il numero di occorrenze di un segmento di stringa

add a note add a note

User Contributed Notes 9 notes

up
7
marcus33cz
2 years ago
If you have problems using count_chars with a multibyte string, you can change the page encoding. Alternatively, you can also use this mb_count_chars version of the function. Basically it is mode "1" of the original function.

<?php
/**
* Counts character occurences in a multibyte string
* @param string $input UTF-8 data
* @return array associative array of characters.
*/
function mb_count_chars($input) {
   
$l = mb_strlen($input, 'UTF-8');
   
$unique = array();
    for(
$i = 0; $i < $l; $i++) {
       
$char = mb_substr($input, $i, 1, 'UTF-8');
        if(!
array_key_exists($char, $unique))
           
$unique[$char] = 0;
       
$unique[$char]++;
    }
    return
$unique;
}

$input = "Let's try some Greek letters: αααααΕεΙιΜμΨψ, Russian: ЙЙЫЫЩН, Czech: ěščřžýáíé";
print_r( mb_count_chars($input) );
//returns: Array ( [L] => 1 [e] => 7 [t] => 4 ['] => 1 [s] => 5 [ ] => 9 [r] => 3 [y] => 1 [o] => 1 [m] => 1 [G] => 1 [k] => 1 [l] => 1 [:] => 3 [α] => 5 [Ε] => 1 [ε] => 1 [Ι] => 1 [ι] => 1 [Μ] => 1 [μ] => 1 [Ψ] => 1 [ψ] => 1 [,] => 2 [R] => 1 [u] => 1 [i] => 1 [a] => 1 [n] => 1 [Й] => 2 [Ы] => 2 [Щ] => 1 [Н] => 1 [C] => 1 [z] => 1 [c] => 1 [h] => 1 [ě] => 1 [š] => 1 [č] => 1 [ř] => 1 [ž] => 1 [ý] => 1 [á] => 1 [í] => 1 [é] => 1 )
?>
up
1
apinpratap at gmail dot com
7 years ago
this code can find each characters count

<?php
$enter
= 0;
$data = strtolower ($inputString);
foreach (
count_chars ($data, 1) as $i => $val)
    {
        if (
$enter == 1)
        {
           
$enter = 0;
            continue;
        }
        if (
chr ($i) == "\n")
        {
            echo
"There are $val instance(s) of \" Enter \" in the string.\n";
           
$enter = 1;
        }
        else
        {
            echo
"There are $val instance(s) of \"" , chr ($i) , "\" in the string.\n";
        }
    }
?>
up
1
pzb at novell dot com
7 years ago
This function is great for input validation.  I frequently need to check that all characters in a string are 7-bit ASCII (and not null).  This is the fastest function I have found yet:

<?php
function is7bit($string) {
   
// empty strings are 7-bit clean
   
if (!strlen($string)) {
        return
true;
    }
   
// count_chars returns the characters in ascending octet order
   
$str = count_chars($str, 3);
   
// Check for null character
   
if (!ord($str[0])) {
        return
false;
    }
   
// Check for 8-bit character
   
if (ord($str[strlen($str)-1]) & 128) {
        return
false;
    }
    return
true;
}
?>
up
1
seb at synchrocide dot net
10 years ago
After much trial and error trying to create a function that finds the number of unique characters in a string I same across count_chars() - my 20+ lines of useless code were wiped for this:

<?
function unichar($string) {
$two= strtolower(str_replace(' ', '', $string));
$res = count(count_chars($two, 1));
return
$res;
}

/* examples :: */

echo unichar("bob"); // 2
echo unichar("Invisibility"); //8
echo unichar("The quick brown fox slyly jumped over the lazy dog"); //26

?>

I have no idea where this could be used, but it's quite fun
up
1
qeremy [atta] gmail [dotta] com
1 year ago
Another approach to counting unicode chars.

<?php
function count_chars_unicode($str, $x = false) {
   
$tmp = preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);
    foreach (
$tmp as $c) {
       
$chr[$c] = isset($chr[$c]) ? $chr[$c] + 1 : 1;
    }
    return
is_bool($x)
        ? (
$x ? $chr : count($chr))
        :
$chr[$x];
}

$str = "şeker şeker yâriiiiiiiiiimmmmm";
print_r(count_chars_unicode($str, 'â'));    // frequency of "â"
print_r(count_chars_unicode($str));         // count of uniq chars
print_r(count_chars_unicode($str, true));   // all chars with own frequency
?>

Outputs;
1
9
Array
(
    [ş] => 2
    [e] => 4
    [k] => 2
    [r] => 3
    [ ] => 2
    [y] => 1
    [â] => 1
    [i] => 10
    [m] => 5
)
up
0
Eric Pecoraro
9 years ago
<?php

// Require (n) unique characters in a string
// Modification of a function below which ads some flexibility in how many unique characters are required in a given string.

$pass = '123456' ; // true
$pass = '111222' ; // false

req_unique($pass,3);

function
req_unique($string,$unique=3) {
    if (
count(count_chars($string,1)) < $unique) {
        echo
'false';
    }else{
        echo
'true';
    }
}

?>
up
-1
mlong at mlong dot org
12 years ago
// Usefulness of the two functions

<?php
$string
="aaabbc";

// You just want to count the letter a
$acount=substr_count($string,"a");

// You want to count both letter a and letter b
$counts=count_chars($string,0);
$acount=$counts[ord("a")];
$bcount=$counts[ord("b")];
?>
up
-1
phpC2007
6 years ago
Here's a function to count number of strings in a string. It can be used as a simple utf8-enabled count_chars (but limited to a single mode)...

<?php
function utf8_count_strings($stringChar)
{
   
$num = -1;
   
$lenStringChar = strlen($stringChar);
   
    for (
$lastPosition = 0;
       
$lastPosition !== false;
       
$lastPosition = strpos($textSnippet, $stringChar, $lastPosition + $lenStringChar))
    {
       
$num++;
    }
   
    return
$num;
}
?>
up
-1
maotin at hongkong dot com
13 years ago
Here are some more experiments on this relatively new and extremely handy function.

<?php
$string
= 'I have never seen ANYTHING like that before! My number is "4670-9394".';

foreach(
count_chars($string, 1) as $chr => $hit)
echo
'The character '.chr(34).chr($chr).chr(34).' has appeared in this string '.$hit.' times.<BR>';

#The result looks like
#The character " " has appeared in this string 11 times.

echo count_chars($string,3);
#The output is '!"-.034679AGHIMNTYabefhiklmnorstuvy'

echo strlen($string).' is not the same as '.strlen(count_chars($string, 3));

#This shows that '70 is not the same as 36'
?>

As we can see above:

1)If you cares only about what is in the string, use count_chars($string, 1) and it will return an (associative?) array of what shows up only.

2) Either I misunderstood what the manul actually said, or it does not work the way it described: count_chars($strting, 3) actually returned a string of what characters are in the string, not a string of their byte-values (which is great because a string of numbers would be much harder to handle);

3)This is a short version of password checking: get the original string's length, then compare with the length of the string returned by count_chars($string,3). 

<?php
$length_of_string
= strlen($string);
$num_of_chars = strlen(count_chars($string, 3));

$diff = ($length_of_string - $num_of_chars);

if (
$diff)
echo
'At least one character has been used more than once.';
else
echo
'All character have been used only once.';
?>

Note that since $num_of_chars gives no information about the actual number of occurance, we cannot go any further by the same rationale and say when $diff =2 then 2 characters showed up twice; it might be 1 character showd up 3 times, we have no way to tell (a good tolerance level setter, though).  You have to get the array and check the values if you want to have more control.

4) Final trick: now we have a primitive way to count the number of words in a string! (or do we have a fuction for that already?)
To Top