How php counts the number of words in a string

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1. With the help of the array, divide the string, convert each word in the string into the array elements in the array, and count the number of array elements.

For example, I have a string with 9 words in the string:

$str = "the quick brown fox jumps over the lazy dog"

You can first use the explode () function to split a string into several substrings based on spaces, and then combine these substrings into an array and return.

$arr = explode ('', $str)

2. Using the str_word_count () function, PHP directly calculates the number of words in the string on the built-in function str_word_count ().

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