Rechercher une fonction PHP

count_chars

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(PHP 4, PHP 5, PHP 7)

count_chars — Return information about characters used in a string

Description

count_chars ( string $string [, int $mode = 0 ] ) : mixed

Counts the number of occurrences of every byte-value (0..255) in string and returns it in various ways.

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Parameters

string

The examined string.

mode

See return values.

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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 unique characters is returned.
  • 4 - a string containing all not used characters is returned.

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Examples

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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See Also

  • strpos() - Find the position of the first occurrence of a substring in a string
  • substr_count() - Count the number of substring occurrences

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Document created the 30/01/2003, last modified the 26/10/2018
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References

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