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This article introduces the relevant knowledge of "how to judge a few characters in a string by php". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Judgment method: 1, use the "str_split ($str)" statement to convert the string into an array of characters; 2, use the "array_unique ($arr)" statement to remove repeated characters in the array; 3, use the "count (de-duplicated array)" statement to count the length of the array after deduplication, you can get the number of different characters.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php determines that there are certain characters in a string, that is, to determine which different characters are in the string. Next, I would like to introduce the method of judgment.

Implementation method:

1. Use the str_split () function to convert a string into a character array

2. Use the array_unique () function to remove repetitive characters

$newarr=array_unique ($arr); var_dump ($newarr)

Returns a new array whose key values are non-repeating characters in the string.

3. Use the count () function to count the length of the deduplicated array, and you can know the number of different characters in the string.

Echo count ($newarr)

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