Question

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Check if a variable is a natural number

Just came across where I need to sanitize an input and remove all non-digit characters with PHP. Thought of making a function myself, but just first wanted to check up on the possible built-in functions, so I won’t have to spend extra time reinventing the wheel.

Answer 1

You can use regular expression as below

$int = (int) preg_replace('/\D/', '', $strNonNumeric);

OR

$int = (int) preg_replace('/[^0-9]/', '', $strNonNumeric);