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@ 2017-07-04T12:54:12Z

<?php
$purchaseCreateAt = '20170421';
$inflowDate = '-00011130';

echo strpos($inflowDate, '-') === 0 ? $purchaseCreateAt : $inflowDate;

echo substr($inflowDate,0,1) === '-' ? $purchaseCreateAt : $inflowDate;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
strpos: documentation ( source)

preferences:dark modelive preview

42.46 ms | 402 KiB | 5 Q