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Hello Friends Today, through this tutorial, I will tell you How to Use `count_chars()` function using PHP, PHP 8, PHP 8.1, PHP 8.2 With Example. In PHP, the `count_chars()` function is used to count the number of occurrences of each byte-value (0 to 255) in a string. This function returns either an array or a string depending on the value of the second parameter passed to it. Here’s how you can use `count_chars()` function in PHP 8.2 with an example:
<?php
// Example string
$string = "hello world";
// Using count_chars with mode 0 (default), returns an array with the ASCII values as keys and their frequencies as values
$resultArray = count_chars($string, 0);
echo "Byte values and their frequencies in the string:\n";
foreach ($resultArray as $byteValue => $frequency) {
echo "Byte value: $byteValue, Frequency: $frequency\n";
}
// Using count_chars with mode 1, returns a string containing all the distinct characters used in the string
$resultString = count_chars($string, 1);
echo "\nDistinct characters used in the string: $resultString\n";
?>
Output:
Byte values and their frequencies in the string: Byte value: 32, Frequency: 1 Byte value: 100, Frequency: 1 Byte value: 101, Frequency: 1 Byte value: 104, Frequency: 1 Byte value: 108, Frequency: 3 Byte value: 111, Frequency: 2 Byte value: 114, Frequency: 1 Byte value: 119, Frequency: 1 Distinct characters used in the string: dehlorw
In this example, the first call to `count_chars()` with mode 0 returns an array where each key represents a byte value (ASCII value) present in the string, and the corresponding value represents the frequency of that byte value in the string.