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Programming PHP, 3rd Edition by Peter MacIntyre, Kevin Tatroe, Rasmus Lerdorf

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Name

count_chars

Synopsis

mixed count_chars(string string[, int mode])

Returns the number of occurrences of each byte value from 0–255 in string; mode determines the form of the result. The possible values of mode are:

0 (default)

Returns an associative array with each byte value as a key and the frequency of that byte value as the value

1

Same as above, except that only byte values with a nonzero frequency are listed

2

Same as above, except that only byte values with a frequency of zero are listed

3

Returns a string containing all byte values with a nonzero frequency

4

Returns a string containing all byte values with a frequency of zero

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