How to implement php to intercept the last few digits of a string

php method to intercept the last four digits of a string: first create a PHP sample file; then intercept the last four digits of the specified string through the "substr($str_bh,-4);" method; and finally output it through echo Just intercept the results.

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Example:

After PHP intercepts the string Four digits

$str_bh='123456789'; $abc=substr($str_bh,-4); echo $abc;

Output result: 6789

Result: world

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