php count_chars() function

Translation results：

UK[tʃa:z] US[tʃa:z]

abbr.characters (plural) roles, characters (terms used in scripts)

v. Burn... into charcoal, burn ...charred (third person singular of char); burnt into charcoal, charred; <Master Ying> working as a handyman maid

php count_chars() functionsyntax

Function:Returns a string containing all the different characters used in the string

Syntax: count_chars(string,mode)

Parameters:

Parameter	Description
string	Required. Specifies the string to check.
mode	Optional. Specifies the return mode. The default is 0. The following are the different return modes: 0 - array, ASCII value as key name, the number of occurrences as key value, 1 - array, ASCII value as key name, the number of occurrences as key value, only values with occurrences greater than 0 are listed , 2 - array, ASCII value is the key name, the number of occurrences is the key value, only values with the number of occurrences equal to 0 are listed, 3 - string, with all different characters used, 4 - string, with All unused different characters

Description: Returns information about the characters used in the string

<?php
//使用模式3输出
$str = "Hello php.cn!";
echo count_chars($str,3);
?>

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Output:

!.Hcehlnop

<?php
//使用模式1的数组形式输出
$str = "Hello php.cn!";
print_r(count_chars($str,1)) ;
?>

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Output:

Array ( [32] => 1 [33] => 1 [46] => 1 [72] => 1 [99] => 1 [101] => 1 [104] => 1 [108] => 2 [110] => 1 [111] => 1 [112] => 2 )