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count_chars ( ) - Count character occurences of each byte value
The count_chars() string function in PHP is a means for finding how many times a character or space occurs in a string. It also returns different results and changes functionality by changing the mode number(0 - 4). 

Here is a quick explanation what each mode returns:

0 - an array with the byte-values as keys and the character occurrence number as value
1 - an array with the byte-values as keys where the character occurrence number is greater than zero
2 - an array with the byte-values as keys where the character occurrence number is equal to zero
3 - all unique characters
4 - all characters not occurring in the string

Learn HTML
<?php
$myString 
"www.developphp.com";
$strArray count_chars($myString1);
foreach (
$strArray as $key => $value) {
   echo 
"<strong>'".chr($key)."'</strong> is found $value time(s)<br />";
}
?>

Develop PHP browser display window
'.' is found 2 time(s)
'c' is found 1 time(s)
'd' is found 1 time(s)
'e' is found 2 time(s)
'h' is found 1 time(s)
'l' is found 1 time(s)
'm' is found 1 time(s)
'o' is found 2 time(s)
'p' is found 3 time(s)
'v' is found 1 time(s)
'w' is found 3 time(s)


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