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@ 2014-07-11T05:03:52Z

<?php

$utf8string = 'ASCIIユーティーエッフ８hello123等々';

$var = 'hello123';

$pos = strpos($utf8string, $var);
echo $pos;
if ($pos!==false) {
    echo substr($utf8string, 0, $pos);
}

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

30.89 ms | 402 KiB | 5 Q