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.
Parameters
- string
-
The examined string.
- mode
-
The optional parameter mode defaults to 0.
Return Values
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.
Exempel
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.