PHP count_chars()function

PHP count_chars() is most important string function. It is used to return information about characters in a string.

Syntax:

Parameter	Description	Required/Optional
string	The string to be checked	Required
mode	Specify the return modes	Optional

Note: Depending on mode 'count_chars()' function returns one of the following:

0 : It is an array with the byte-value as key and the frequency of every byte as value.
1 : It is same as 0 but only byte-value with a frequency greater than zero are listed.
2 : same as 0 but only byte-values with a frequency equal to zero are listed.
3 : a string containing all unique characters is returned.
4 : a string containing all not used characters is returned.

Example 1

<?php
$str = "Hello World!";
echo "Your given string: ".$str;
echo "<br>"."By using 'count_chars()' function your string is :".count_chars($str,3);
?>

Output:

Your given string: Hello World!
By using 'count_chars()' function your string is : !HWdelor

Example 2

<?php
$data = "Two Ts and one F.";
foreach (count_chars($data, 1) as $i => $val) {
   echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}
?>

Output:

Array ( [32] => 1 [33] => 1 [72] => 1 [87] => 1 [100] => 1 [101] => 1 [108] => 3 [111] => 2 [114] => 1 )

Example 3

<?php
$str = "PHP is Lovely Language!";
$strArray = count_chars($str,1);

foreach ($strArray as $key=>$value)
   {
   echo "The character <b>'".chr($key)."'</b> was found $value time(s)<br>";
   }
?>

Output:

The character ' ' was found 3 time(s)
The character '!' was found 1 time(s)
The character 'H' was found 1 time(s)
The character 'L' was found 2 time(s)
The character 'P' was found 2 time(s)
The character 'a' was found 2 time(s)
The character 'e' was found 2 time(s)
The character 'g' was found 2 time(s)
The character 'i' was found 1 time(s)
The character 'l' was found 1 time(s)
The character 'n' was found 1 time(s)
The character 'o' was found 1 time(s)
The character 's' was found 1 time(s)
The character 'u' was found 1 time(s)
The character 'v' was found 1 time(s)
The character 'y' was found 1 time(s)

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