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@ 2013-11-15T17:11:13Z

<?php
echo (strpos('CNXXXXXX122334.txt','CN') == 0);
echo (strpos('CNXXXXXX122334.txt','XT') == 0);
echo (strpos('CNXXXXXX122334.txt','XT') == 1);

Output
Performance
VLD
References
Branches

strpos: documentation ( source)

preferences:dark modelive preview

40.9 ms | 402 KiB | 5 Q