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@ 2014-08-28T09:15:08Z

<?php
$bad_char    =  "♥";
$error_msg = "Illegal: $bad_char";
$code   = "I \$♥ PHP";
if ( mb_strpos( $code,  $bad_char) )
{
 exit( $error_msg );
}

Output
Performance
VLD
References
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mb_strpos: documentation ( source)

preferences:dark modelive preview

35.68 ms | 402 KiB | 5 Q