How php counts the number of different characters in a string

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Statistical methods: 1, use the "str_split (string)" statement to split the string and convert it into a character array; 2, use the "sizeof (array_count_values)" statement to count the number of different characters.

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

Php counts the number of different characters in a string

In php, you can count the number of different characters in a string with the help of array functions.

First use str_split () to convert a string to a character array

Using array_count_values () to count the number of occurrences of all values in a character array returns an associative array whose element's key name is the value of the original array and the key value is the number of times that value appears in the original array.

The key name of an associative array is the different characters in the string

Use sizeof () to count the number of elements in the associative array.

Implementation code:

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