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@ 2014-07-08T16:05:12Z

<?php
preg_match('/^[-?]\d+$/', '1000', $matches);
print_r ($matches);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

35.44 ms | 402 KiB | 5 Q