How Can I Extract Whole Numbers from a String in PHP?

Isolating Whole Numbers Within a Textual String

Extracting integers from a string that contains both numerical and alphabetical characters can be a common task. For instance, you may encounter a situation where you need to extract the number 11 from a string such as "In My Cart : 11 items."

Using Filter_Var for Integer Extraction

To isolate the digits without fuss, the filter_var function offers a convenient solution. This function allows you to sanitize user input and extract numeric data. Let's see an example using filter_var:

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

In this example, we assign the string to the $str variable. Next, we call filter_var, providing $str as the input and FILTER_SANITIZE_NUMBER_INT as the filter type. This filter removes all non-numeric characters from the string, effectively isolating the integer 11.

Finally, we cast the result to an integer using (int), ensuring it is represented as a numerical value. The value assigned to $int will be 11. This method is straightforward and efficient for extracting whole numbers from textual strings.

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