function_exists — Return TRUE if the given function has been defined

👁 조회 4,520 📅 2009-08-30 🔗 참고사이트

bool function_exists ( string $function_name )

<?php
if (function_exists('imap_open')) {
echo "IMAP functions are available.<br />\n";
} else {
echo "IMAP functions are not available.<br />\n";
}
?>

if(function_exists("mb_detect_encoding")) {
echo "33333333";
echo "<br/>";
}

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