How does PHP remove characters from text and retain numbers

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1. Use trim ($str) to remove spaces at both ends.

Use the if statement to ensure that the stripped string is not an empty string.

2. Create a character array $temp that contains 09digits respectively.

3. Use the for loop to traverse the string $str, compare each character in the $str with the elements in the $temp array, and get the numeric characters.

(use the in_array function to search for whether each character in $str exists in the $temp array, so you can determine whether the character is a numeric character.)

Example

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