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@ 2013-11-15T17:11:37Z

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

Output
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References
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strpos: documentation ( source)

preferences:dark modelive preview

50.07 ms | 402 KiB | 5 Q