How Can I Extract Integers from Alphanumeric Strings in PHP?

Extracting Integers from Complex Strings: A Practical Approach

When dealing with data that combines letters and numbers, it becomes necessary to extract specific numeric values. Consider the example string:

"In My Cart : 11 items"

The task is to isolate the integer "11" from this string.

Solution Using filter_var()

For this scenario, the filter_var() function proves an efficient solution. This function filters out all non-numeric characters in the provided string.

The following code demonstrates how to use filter_var():

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

By employing the FILTER_SANITIZE_NUMBER_INT filter, filter_var() sanitizes the string, removing any non-numeric characters. The sanitized string is then cast to an integer using (int), effectively extracting the desired value.

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