How to remove non-digits in php

php method to remove non-digits: first create a PHP sample file; then create a string containing non-digits; finally pass "preg_replace('/\D/','','a1asd2asd3a'); " method can remove non-digits.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

Specific questions:

Looking for a php regular expression to remove non-digits

For example:

"a1asd2asd3a"

Output after regular filtering

123

Don’t use intval() or (int) because it won’t work if it’s more than 10 digits

Solution

echo preg_replace('/\D/','','a1asd2asd3a');

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