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PHP String Character Functions Manual
The count_chars() function is used to return information about the characters used in the string
mixed count_chars ( string $string[, int $mode = 0 ] )
Used to return information about the characters used in the string
count_chars() returns different results based on different modes:
0 - An array with all byte values as key names and counts as values.
1 - Same as 0, but only lists byte values with a count greater than zero.
2 - Same as 0, but only lists byte values with a count of zero.
3 - Returns a string composed of all used byte values.
4 - Returns a string composed of all unused byte values.
| Number | Parameter and Description |
|---|---|
| 1 | string The string to be counted. |
| 2 | mode It returns the mode, please see the above return value |
In this example, we will use count_chars() to check the string, the return mode set to 1. Output the number of times different characters appear:
<?php
//Use count_chars() to check the string, the return mode set to 1. Output the number of times different characters appear
foreach (count_chars($data, 1) as $i => $val) {
echo "The string contains \"$val\" times\", chr($i), "\" character.\n";
}
?>Test and see ‹/›Output result:
The string contains 4 the character " ". The string contains 1 the character ".". The string contains 1 the character "F". The string contains 2 the character "T". The string contains 1 the character "a". The string contains 1 the character "d". The string contains 1 the character "e". The string contains 2 the character "n". The string contains 2 the character "o". The string contains 1 the character "s". The string contains 1 the character "w".