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@ 2013-07-19T07:02:36Z

<?php
print_r($_SERVER);
$a = 'opt.site.com';
$b = strpos($a, 'opt.');
if($b === 0) {
    echo 'pos 0';
} else {
    echo 'error!';
}

Output
Performance
VLD
References
Branches

strpos: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

35.95 ms | 402 KiB | 5 Q