How to Use the is_real Function to Determine Which POST Submitted Data is of Float Type?

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<h2>How to Use the is_real Function to Determine Which POST Submitted Data is of Float Type?</h2>
<p>In PHP, when handling data submitted via POST, you often need to determine whether a particular value is a float (i.e., a real number). PHP does not have a built-in function named <code>is_real

5. Considerations

• If the float is in scientific notation (e.g., 1.2e3), the above regular expression will not match. You may need to adjust the pattern as necessary.
• There may be precision errors with floats in PHP, so it is best to focus on the format when performing this check.
• It is recommended to use filter_var() or regular expressions for strict validation of user input to avoid illegal values.

Conclusion

Although PHP does not have a built-in function named is_real(), we can create a custom function that combines is_numeric() and regular expressions to accurately determine which values in POST data are floats. This approach helps us better process and validate user inputs, ensuring data integrity.