PHP | count_chars() Function
The count_chars() is an inbuilt function in PHP and is used to perform several operations related to string like the number of an ASCII character occurs in a string.
Syntax :
count_chars(string,return_mode);
Parameters: The count_chars() function takes two parameters string and return_mode as explained below:
- string : This parameter refers to the input string on which the operation is to be performed.
-
return_mode : This parameter is optional. This parameter defines the operation needed to be performed on the string. It takes value 0, 1, 2, 3, 4.
- 0 : If this mode is chosen, the function will return an array with key-value pairs whose keys are ASCII values and the correspondng values will be the number of occurrences of that ASCII value.
- 1 : If this mode is chosen, the count_chars() function will return an array with key-value pairs whose keys are ASCII values and the correspondng values will be the number of occurrences of that ASCII value . Here, the array will contain only those keys as ASCII values whose frequency is greater than 0.
- 2 : In this mode, the function will return an array of key-value pairs where key are the ASCII value whose frequency in the string is 0.
- 3 : In this mode the count_chars() function will return a string of all different characters used in the string in ascending order.
- 4 : In this mode the count_chars() function will return a string of characters that are not used in input string
Return Type: This function will return an array or string depending on the parameter return_mode as described above.
Examples:
Input : string = "GeeksforGeeks" , return_mode = 3 Output : Gefkors
Below is the PHP program to illustrate the working of count_chars() function:
<?php // PHP program to illustrate count_chars() // Input string $string = "geeksforgeeks"; // return_mode 1 print_r(count_chars($string,1)); // return_mode 3 print_r(count_chars($string,3)); // return_mode 4 print_r(count_chars($string,4)); ?> |
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Output:
Array
(
[101] => 4
[102] => 1
[103] => 2
[107] => 2
[111] => 1
[114] => 1
[115] => 2
)
efgkors
!"#$%&'()*+,-./0123456789:;?@ABCDEFGHIJKLMNOPQRSTUVWXY
Z[\]^_`abcdhijlmnpqtuvwxyz{|}~??????????????????????
????? ¡¢£¤¥¦§¨©ª«¬®¯´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×
ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ
The above program shows the return values for string “geeksforgeeks” with return_mode as 1, 3 and 4. You can modify the program by changing the value of return_mode in the function call to see the returned values for modes 0 and 2 also.
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