php – count_chars function

count_chars

(PHP 4, PHP 5)
count_chars — Return information about characters used in a string
Description
mixed count_chars ( string string [, int mode] )

Counts the number of occurrences of every byte-value (0..255) in string and returns it in various ways. The optional parameter mode defaults to 0. Depending on mode count_chars() returns one of the following:

0 – an array with the byte-value as key and the frequency of every byte as value.

1 – same as 0 but only byte-values 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 used byte-values is returned.

4 – a string containing all not used byte-values is returned.

Example 1. count_chars() example
<?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”;
}
?>

The above example will output:

There were 4 instance(s) of ” ” in the string.
There were 1 instance(s) of “.” in the string.
There were 1 instance(s) of “F” in the string.
There were 2 instance(s) of “T” in the string.
There were 1 instance(s) of “a” in the string.
There were 1 instance(s) of “d” in the string.
There were 1 instance(s) of “e” in the string.
There were 2 instance(s) of “n” in the string.
There were 2 instance(s) of “o” in the string.
There were 1 instance(s) of “s” in the string.
There were 1 instance(s) of “w” in the string.

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