COUNT_CHARS(3) 1 COUNT_CHARS(3)
count_chars - Return information about characters used in a string
SYNOPSIS
mixed count_chars (string $string, [int $mode])
DESCRIPTION
Counts the number of occurrences of every byte-value (0..255) in $string and returns it in various ways.
PARAMETERS
o $string
- The examined string.
o $mode
- See return values.
RETURN VALUES
Depending on $modecount_chars(3) returns one of the following:
o 0 - an array with the byte-value as key and the frequency of every byte as value.
o 1 - same as 0 but only byte-values with a frequency greater than zero are listed.
o 2 - same as 0 but only byte-values with a frequency equal to zero are listed.
o 3 - a string containing all unique characters is returned.
o 4 - a string containing all not used characters is returned.
EXAMPLES
Example #1
count_chars(3) 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.
";
}
?>
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.
SEE ALSO
strpos(3), substr_count(3).
PHP Documentation Group COUNT_CHARS(3)
