count_chars

Return information about characters used in a string (PHP 4 )
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 default 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.

See also strpos() and substr_count().

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