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@ 2013-06-13T10:31:00Z

<?php

$utf8string = 'ASCI８hello123等々';

$var = 'hello123';
$pos = strpos($utf8string, $var);
if ($pos!==false) {
    echo substr($utf8string, 0, $pos);
}

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

36.33 ms | 402 KiB | 5 Q