In this article, you will learn how to get information about the characters in a string. The PHP count_chars() function returns the information about the string characters.
For example, if you want to count of character appears in a string, or to check if a character exist or not, the count_chars() function return this information.
What is the syntax of the COUNT_CHARS() function in php?
count_chars(string,mode)| Parameter | Description |
|---|---|
| string | The string to get the information from – Required |
| mode | There are different modes of output. These modes are explained following. 0 – It returns an array that contains ASCII values as keys and their occurrence as values. 1 – It returns an array that contains ASCII values as keys and their occurrences as values (occurrences only greater than 0). 2 – It returns an array that contains ASCII values as keys and their occurrences as values (occurrences only equal to 0). 3 – String containing the strings used. 4 – String containing the strings unused. |
Examples of the COUNT_CHARS() function
Example 1. In this example, we returned all the unused characters in the given string.
<?php
$str = "Hello World!";
echo count_chars($str,4);
?>Example 2. In this example, we use the count_char function with mode 1 that returns an array that contains ASCII values as keys and their occurrence as values.
<?php
$str = "Hello World!";
print_r(count_chars($str,1));
?>Example 3. In this example, we count the number of ASCII characters in the string.
<?php
$str = "PHP is pretty fun!!";
$strArray = count_chars($str,1);
foreach ($strArray as $key=>$value)
{
echo "The character <b>'".chr($key)."'</b> was found $value time(s)<br>";
}
?>
