How Can I Extract Integers from Strings Containing Alphanumeric Characters in PHP?

Extracting Integers from Non-Numeric Strings

To extract an integer from a string that contains both numbers and letters, a practical approach is to use PHP's filter_var() function. This function provides a convenient way to sanitize and extract specific types of data from a string.

Using filter_var() to Extract Unsigned Integers

To extract an unsigned integer from a string like "In My Cart : 11 items," you can use the following code:

$str = 'In My Cart : 11 items';
$int = (int) filter_var($str, FILTER_SANITIZE_NUMBER_INT);

By using the FILTER_SANITIZE_NUMBER_INT filter, the filter_var() function effectively removes all non-numeric characters from the string, leaving only the integer value. The result is then cast to an integer using the (int) type casting.

This approach is simple and efficient for extracting integers from strings that contain both numbers and letters.

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